Thousands turned out to see Jennifer Lopez make her London red carpet comeback.

Wearing a one-shoulder black dress, chunky necklace and killer heels, she spent time signing autographs and taking pictures with fans at the premiere of The Back-Up Plan. It has been seven years since the actress and singer unveiled a film in the UK.

Impressed with the turnout, J-Lo said: "I'm overwhelmed. It's an amazing reception. Last time I was here was for Maid In Manhattan, so it was a while ago."

The 40-year-old was joined by co-star Alex O'Loughlin in Leicester Square, which was decked out in pink for the occasion. The Autralian heartthrob said Jennifer is a natural when it comes to rom-coms.

"She's the best comedic actor I've ever worked with. She taught me a lot about the importance of throwing yourself into it completely and not worrying about what you look like. She's really courageous," said Alex.

The Back-Up Plan follows a woman who decides to stop looking for the perfect man, but ends up finding him when she least expected it - after falling pregnant through artificial insemination.

The A-lister, who took two years off raising twins Max and Emme, said becoming a mum was part of her inspiration: "The pregnancy that I had just gone through definitely helped me with the film."