The youngster will arrive in Walford in early 2016, and as her family aren’t exactly in the best place right now, it’s not exactly a brilliant moment for the teen to return.
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Tilly will play Louise
Louise - who is now 14 - was previously reunited with Peggy in 2010, after the Mitchell matriarch decided Phil was in no fit state to care for her.
Bosses are remaining tight-lipped on what brings Louise back to Albert Square, but this is ‘EastEnders’, so we reckon a huge surprise is probably in store.
Tilly has shared her excitement at landing the role, stating: “I am so thrilled to be joining the cast of ‘EastEnders’, especially to be joining the Mitchell clan!”
“It’s a dream come true and I can’t wait to get stuck into the role and see what lies in store for Louise,” the 18-year-old adds.
Louise’s arrival will come following a hectic festive season, and the Mitchells are set go head-to-head with the Beales on Christmas Day.
Viewers will see the families attempting to spend the 25 December together, but things reach boiling point, and with the adults at war, Bobby’s behaviour towards Dennis could almost go unnoticed.
Catch up on all the latest ‘EastEnders’ news and spoilers here.
'EastEnders' Recasts
Ben Mitchell (01 of10)
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Played by: Charlie Jones (2006–10), Joshua Pascoe (2010–12) and Harry Reid (2014–).Two other actors also played the troubled youngster back in the '90s, but since returning to Albert Square when Kathy Beale "died" in 2006, these three stars have been tasked with starring as Phil's son. (credit:BBC Pictures)
Lauren Branning(02 of10)
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Played by: Madeline Duggan (2006–10), Jacqueline Jossa (2010–).We loved Madeline, but casting Jacqueline as Lauren was a genius move, and under her careful watch, Lauren's been at the centre of a number of a key storylines, battling alcoholism, figuring out who killed her best friend and welcoming her own baby. (credit:Mark Cuthbert/Getty Images/BBC Pictures)
Bobby Beale (03 of10)
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Played by: Alex Francis (2007–12), Rory Stroud (2013–14), Eliot Carrington (2014–).Yes, we know - we should have solved the 'Who killed Lucy Beale?' case when Bobby was randomly recast as the plot kicked off. The Beale family have proven difficult for the soap's bosses, and all of Ian's kids have been recast at least once. Kevin Curran also starred as Bobby when he was a tot. (credit:BBC Pictures)
Lucy Beale (04 of10)
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Played by: Melissa Suffield (2004–10) and Hetti Bywater (2012–15). Another two actresses also played Lucy in her younger years, but it's Melissa and Hetti that fans will remember (though admittedly, Melissa's Lucy probably won't be remembered for the right reasons...) (credit:BBC Pictures)
Mark Fowler(05 of10)
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Played by: David Scarboro (1985–87) and Todd Carty (1990–2003).Todd took over as Mark following David's death. The character went on to become one of Walford's most-loved residents, and when Todd bid farewell to the soap, viewers said an emotional goodbye. (credit:PETER BROOKER/REX Shutterstock/BBC Pictures)
Sam Mitchell(06 of10)
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Played by: Danniella Westbrook (1990–2000), Kim Medcalf (2002–05) and Danniella (again) (2009–10).In one of the most bizarre recastings ever, Kim played Sam Mitchell, for nearly three years, however when Sam returned to Albert Square in 2009, she'd morphed back into Danniella again. (credit:Dan Wooller/REX Shutterstock/Nils Jorgensen)
Martin Fowler(07 of10)
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Played by: Jon Peyton-Price (1985–96), James Alexandrou (1996–2007) and James Bye (2014–).James II took over the role when Martin returned to the Square in 2014, and admittedly, it did take a while for us to stop wondering where the old James was. (credit:BBC Pictures)
Shabnam Masood(08 of10)
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Played by: Zahra Ahmadi (2007–08) and Rakhee Thakrar (2014–).Rakhee's starred in a number of emotional storylines since joining the soap, and her stillbirth episodes made for some of the most tear-jerking soap scenes of 2015. (credit:BBC Pictures)
Dennis Rickman(09 of10)
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Played by: Harry Hickles (2012–15) and Bleu Landau (2015–).Let's be honest - this was a long time coming. Perhaps now, Denny will actually leave his room and get some much-needed vitamin D. (credit:BBC Pictures)
Peter Beale(10 of10)
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Played by: Every actor in existence. Thomas Law and Ben Hardy are just two in a long line of Peter Beales, as a whooping six actors have tackled the role. Ben is now busy cracking Hollywood, which leaves us wondering whether he'd ever return to the soap. Could another recast be on the cards? (credit:BBC Pictures)