The singer was centimetres from a wardrobe malfunction as she gyrated on the floor during a risqué routine.
As she gave her first UK performance of her new single, she showed off her famous J-Lo curves (and then some) in a eye-wateringly high-cut black PVC leotard, which she teamed with thigh-high leather boots, and a heeeuge feather jacket.
The raunchy spectacle left hosts Ant and Dec lost for words as they spoke to the US star following the performance, while judge Amanda Holden commented: "Well, J-Lo's arse - I just wanted to bite it."
Simon Cowell seemed equally impressed, adding: "Seriously, JLo. If anyone wants to know how you do it. That's how you do it."
However, over on Twitter, while some users agreed how hot the 43-year-old looked on stage, others were questioning if her choice of costume was too much for a family show.
One tweeter wrote: "Jennifer Lopez was just way to much on BGT.. There's young children watching and she has her popo all up in the camera. Put it away girl! (sic)"
Another said: "Just watched the @JLo performance on BGT. She needs educating by @Beyonce regarding the sexy/trashy debacle when performing. #PutItAway."
Actress Jennifer Lopez filming <em>Selena</em>.
Actress Jennifer Lopez wears a denim dress with long gold scarf and matching belt.
Singer Jennifer Lopez performs wearing all white: hotpants, boots, wide-brimmed hat and zip top.
American singer and actor Jennifer Lopez stands backstage, wearing a pink tracksuit and cap.
Jennifer Lopez in that Versace dress at the Grammy Awards.
Jennifer Lopez and Ben Affleck attend the Academy Awards. She wears a light green on shouldered dress with statement jewellery.
Actress/singer Jennifer Lopez wears a black leather jacket with boyfriend Ben Affleck watching the New York Yankees.
Actress/singer Jennifer Lopez looks smart wearing a skirt, shirt and jumper.
Actress Jennifer Lopez leaves her A/W 2005 show during New York Fashion Week wearing a full-length fur coat.
Jennifer Lopez performs wearing a cut out gold top and black trousers with her hair short and curly.
Actress Jennifer Lopez wears a grey jumper with silver fishtail skirt and matching belt for her film premiere.
Actress Jennifer Lopez matches her dark outfit with her newly dyed dark hair.
Actress Jennifer Lopez wears a one-shoulder coral pink gown.
Singer/actress Jennifer Lopez shows her baby bump in this floor-length brown dress.
Singer Jennifer Lopez wears a figure hugging black dress with knee-high boots.
Actress and siger Jennifer Lopez wears black top and grey scarf.
Jennifer wears a cream embellished catsuit.
Jennifer Lopez wears a figure hugging red dress with shoulder detail.
US singer and actress Jennifer Lopez rocks boho chic with this dress and matching headband.
Actress/singer Jennifer Lopez arrives at the BAFTAs wearing a cut out dark green dress.
Jennifer Lopez dazzles in this short silver number.
Entertainer Jennifer Lopez arrives for the Academy Awards wearing a white a gold dress with plunge neckline.
Jennifer Lopez wears another plunge neckline.
Actress Jennifer Lopez attends the Los Angeles premiere of <em>What To Expect When You're Expecting </em> wearing a cream dress with deep red lips.
Singer/actress Jennifer Lopez celebrates the launch of her new single, <em>Goin' In</em> wearing a short white and gold dress.
Jennifer Lopez performs on stage wearing a silver corset.
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