The best pictures of the week are chosen by YOU voting on our interactive slideshow.

Monday's World Earth Day reminded us all of our planet's precious resources as demonstrators campaigned for environmental awareness, including stronger forest and wildlife protection and conservation.

22nd April marked the 20th anniversary of the murder of 18-year-old Stephen Lawrence, with a service attended by Stephen's mother and brother and a host of politicians including David Cameron.

The Queen held 87th birthday celebrations in full military style, meanwhile The Duchess of Cambridge had a busy week as she flashed the cameras her beaming smile and growing baby bump at several locations, along with some wizardry with Wills and Harry at the Harry Potter studios.

Not one US president, but four presidents were photographed on stage together on Thursday as Obama, Clinton and Bush Senior and Junior opened the The Bush Library in Texas.

Plus, spot the mini-alien and the cute porcupine - all in our pics of the week below.

Happy voting and we will announce the winner on Monday morning.

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  • The Week In Photos - Vote On Your Favourite Pictures

    LONDON, ENGLAND - APRIL 26: Prince Harry, Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge raise their wands on the set used to depict Diagon Alley in the Harry Potter Films during the Inauguration Of Warner Bros. Studios Leavesden on April 26, 2013 in London, England. (Photo by Chris Jackson - WPA Pool/Getty Images)

  • The Week In Photos - Vote On Your Favourite Pictures

    The mummified remains of what looks like a 6-inch space alien has turned "Sirius" into the most eagerly awaited documentary among UFO enthusiasts. The findings, however, might come as a disappointment. In early publicity, filmmakers claimed the documentary would reveal that the DNA of the creature with an oversized alien-looking head couldn't be medically classified. In fact, the film, which premiered Monday in Hollywood, features a scientist who concluded the little humanoid was human. "I can say with absolute certainty that it is not a monkey. It is human -- closer to human than chimpanzees. It lived to the age of six to eight. Obviously, it was breathing, it was eating, it was metabolizing. It calls into question how big the thing might have been when it was born,"said Garry Nolan, director of stem cell biology at Stanford University's School of Medicine in California.

  • The Week In Photos - Vote On Your Favourite Pictures

    Patrick Kane is fitted with the new Touch Bionics prosthetic hand on April 23, 2013 in Livingston, Scotland. The new i-limb ultra revolution has a powered thumb rotation along with multiple grip patterns, which enables users to perform daily activities easier than with previous prosthesis.

  • The Week In Photos - Vote On Your Favourite Pictures

    This undated photo provided by the City of Atlanta Department of Corrections shows Reese Witherspoon. The Oscar-winning actress was arrested on a disorderly conduct charge after a state trooper said she wouldn't stay in the car while her husband, James Toth, was given a field sobriety test in Atlanta. (AP Photo/City of Atlanta Department of Corrections)

  • The Week In Photos - Vote On Your Favourite Pictures

    History has a chance to turn its eye on the artist Andy Warhol with fresh perspective, as exclusive never-seen-before photos of the artist are displayed in New York exhibition Lost then Found (above), in the Meatpacking district of Manhattan, for 10 days only. Photographer Steve Wood shot the photos in 1981 at La Belle Époque style Royal Hotel in the French town of Deauville. <a href="http://www.huffingtonpost.co.uk/2013/04/24/interview-andy-warhol_n_3133890.html" target="_blank"><strong>Read our interview with photographer Steve Wood, as he tells us about his photo shoot with art icon Andy Warhol.</strong></a>

  • The Week In Photos - Vote On Your Favourite Pictures

    Nadezhda Tolokonnikova, a member of the feminist punk band, Pussy Riot, listens from behind bars at a district court in Zubova Polyana 440 km Southeast of Moscow in Russia's province of Mordovia, Friday, April 26, 2013. A Russian court is to consider whether one of the jailed Pussy Riot members is eligible for early release. Nadezhda Tolokonnikova, in custody since her arrest in March 2012, is serving a two-year sentence for the band's irreverent protest against President Vladimir Putin in Moscow's main cathedral. (AP Photo/Mikhail Metzel)

  • The Week In Photos - Vote On Your Favourite Pictures

    First Lady Michelle Obama, left, and President Barack Obama, center, share a laugh with former first lady Barbara Bush gestures during the dedication of the George W. Bush Presidential Center Thursday, April 25, 2013, in Dallas. (AP Photo/David J. Phillip)

  • The Week In Photos - Vote On Your Favourite Pictures

    Following a session of Robonaut 2 operations controlled by ground personnel, Expedition 35 Flight Engineer Chris Cassidy has a few light moments with the robot in the Destiny Laboratory onboard the Earth-orbiting International Space Station. Robonaut 2 is the first humanoid robot to travel to space and the first U.S.-built robot to visit the space station.

  • The Week In Photos - Vote On Your Favourite Pictures

    A model reacts as she falls on the runway at a fashion show in Lagos, Nigeria, Thursday, April. 25, 2013. Kinabuti, a Nigerian fashion house run by Italian designer Caterina Bortolussi, featured its 2013 collection Thursday night in a show called "Carnival in the Desert" at the Italian consulate in Lagos. (AP Photo/Sunday Alamba)

  • The Week In Photos - Vote On Your Favourite Pictures

    JLS have confirmed they are to split up after six years together, but Aston Merrygold, Marvin Humes, Jonathan 'JB' Gill and Oritsé Williams insist they will remain the best of friends. The band - who came second to Alexandra Burke on 'The X Factor' in 2008 - will say goodbye to fans with a farewell tour.

  • The Week In Photos - Vote On Your Favourite Pictures

    Robert De Niro and cat Lil Bub attend the Directors Brunch during the 2013 Tribeca Film Festival on April 23, 2013 in New York City.

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    TV personality Kim Kardashian attends the E! 2013 Upfront at The Grand Ballroom at Manhattan Center on April 22, 2013 in New York City.

  • The Week In Photos - Vote On Your Favourite Pictures

    Chelsea's Victor Moses, left, reacts after scoring with teammate Fernando Torres, at right, during the Europa League semifinal first leg soccer match against Basel, at the St. Jakob-Park stadium in Basel, Switzerland, Thursday, April 25, 2013. (AP Photo/Keystone, Georgios Kefalas)

  • The Week In Photos - Vote On Your Favourite Pictures

    An eastern screech owl disguised in the hollow of a tree in Georgia, USA. An eastern screech owl is barley visible at the entrance to a tree hole - thanks to its perfectly evolved camouflage. The snaps were captured in Okefenokee Swamp, in Georgia, USA.

  • The Week In Photos - Vote On Your Favourite Pictures

    A young porcupine sits on a scale in the Magdeburger Zoo in Magdeburg, eastern Germany, on April 23, 2013. The porcupine was born on April 1, 2013.

  • The Week In Photos - Vote On Your Favourite Pictures

    The Duchess of Cambridge waves to pupils as she arrives at The Willows Primary School, Wythenshawe, Manchester to launch a new school counselling programme to help combat the effects of drug and alcohol addiction.

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    It is reported that more than 600 people are interested in buying rundown homes in Stoke-on-Trent for £1 each.

  • The Week In Photos - Vote On Your Favourite Pictures

    Liverpool's Luis Suárez appeared to 'bite' Branislav Ivanović during the Premier League clash with Chelsea on Sunday afternoon, and it was only a matter of hours until the Uruguayan went viral. The memes and photoshopped images of Luis Suárez started to appear almost instantly with everything from the player wearing a muzzle, to his opponents being gobbled up by a great white shark.

  • The Week In Photos - Vote On Your Favourite Pictures

    Zachary Quinto, J.J. Abrams, Lifeguard Dean 'Deano' Gladstone, Chris Pine and Karl Urban pose at Bondi Beach at the 'Star Trek Into Darkness' photo call on April 22, 2013 in Sydney, Australia.

  • The Week In Photos - Vote On Your Favourite Pictures

    Filipino candidates for this year's Miss Philippines Earth beauty pageant perform a dance number at the poolside of a hotel at suburban Taguig city, east of Manila, Philippines during their presentation to the media Monday, April 22, 2013. Forty eight contestants from different cities in the country are vying for the title to represent the Philippines in the November 2013 Miss Earth beauty pageant, a contest with a unique theme to save Mother Earth.

  • The Week In Photos - Vote On Your Favourite Pictures

    Robert Smith, lead vocalist and guitarist for the English band The Cure performs during the last stop of the band's tour through Latin America in Mexico City, Sunday, April 21, 2013.

  • The Week In Photos - Vote On Your Favourite Pictures

    British Olympic double gold medallist Mo Farah jumps in front of Tower Bridge during a photo call the day after the 2013 London Marathon in central London on April 22, 2013. Farah ran a half-marathon on April 21 completing the first of of the London Marathon.

  • The Week In Photos - Vote On Your Favourite Pictures

    Soldiers from the King's Troop Royal Horse Artillery perform a ceremonial 41 Gun Royal Salute to mark the 87th birthday of Britain's Queen Elizabeth II in Green Park in central London on April 22, 2013.

  • The Week In Photos - Vote On Your Favourite Pictures

    London based photographer Josh Cole presents his new work in “Physical Graffiti”, an exhibition by Black Rat Projects. Breakdancers and free-running enthusiasts from around the world are caught in split-second suspension as they create momentary artworks with their bodies.

  • The Week In Photos - Vote On Your Favourite Pictures

    Exhibition 'Empire State. New York art now' at the Palazzo delle Esposizioni in Rome on April 22, 2013. The exhibition show how artists might reimagine urban life, and how the city of New York might continue to be a site of contestation. The exhibition will run from April 23 to July 21.

  • The Week In Photos - Vote On Your Favourite Pictures

    British Prime Minister David Cameron poses for photographs with Doreen Lawrence, mother of killed teenager Stephen Lawrence, outside St Martin-in-the-Fields Church in central London on April 22, 2013 as they attend a memorial marking the 20th anniversary of his death. Lawrence, 18, was murdered by a gang of racists who stabbed him as he waited for a bus in Eltham, south-east London on April 22, 1993

  • The Week In Photos - Vote On Your Favourite Pictures

    Bsam Ali, 11, swims in polluted water at a slum area on the outskirts of Sanaa, Yemen, Monday, April 22, 2013. Hundreds of countries globally, mark International Earth Day on April 22, to help raise ecological awareness and support environmental protection. (AP Photo/Hani Mohammed)

  • The Week In Photos - Vote On Your Favourite Pictures

    A boy tries to climb back to a foot bridge after searching for a ball in a canal which is choked by non-bio-degradable garbage in Mumbai, India, Monday, April 22, 2013. April 22 is observed as Earth Day every year as a tool to raise ecological awareness. (AP Photo/Rafiq Maqbool)

  • The Week In Photos - Vote On Your Favourite Pictures

    Indian activists from The People for the Ethical Treatment of Animals (PETA) pose wearing green body paint holding placards during a demonstration in Hyderabad on April 22, 2013, on World Earth Day. PETA exhorts the world to switch to an earth-friendly vegan diet on the occasion of Earth Day. AFP PHOTO/Noah SEELAM (Photo credit should read NOAH SEELAM/AFP/Getty Images)

  • The Week In Photos - Vote On Your Favourite Pictures

    This photo provided by the Lakeville, Massachussetts Police Department shows the remains of what appears to be a foot. The decomposed remains have not yet been positively identified as human, even though it appears to have five toes. The remains have "Bigfoot" theorists abuzz with excitement.

  • The Week In Photos - Vote On Your Favourite Pictures

    There are photobombs and there is this. Yep, Kardashian Queen Bee Kris Jenner was in London's Selfridges store perusing the handbags, apparently oblivious to the rising tide of fans outside the Chanel boutique.

  • The Week In Photos - Vote On Your Favourite Pictures

    The mother of the two Boston bombing suspects, Zubeidat Tsarnaeva, with the suspects' father Anzor Tsarnaev, left, speaks at a news conference in Makhachkala, the southern Russian province of Dagestan, Thursday, April 25, 2013. The father of the two Boston bombing suspects said Thursday that he is leaving Russia for the United States in the next day or two, but their mother said she was still thinking it over.