The 44-year-old actress, who attended the UK premiere on Wednesday evening, opened up about her experience of playing Rose the stripper in the comedy.
"I had an excellent choreographer who I worked with day and night," said Jennifer. "It was not easy but they made it look easy."
The blonde beauty, who attended the premiere with her co-stars Jason Sudeikis and Will Poulter, added that preparing for her role involved "lots of laughter and stomach muscle work."
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Jennifer arrived at the premiere to deafening cheers from her fans, and the rain didn't dampen her smiles. She rocked the alternative blue carpet in a floral-printed skater dress that had a striking double hem, and stopped to sign autographs and chat to fans.
Talking about her supportive fan base, Jennifer said, "It means the world to me — they are so loving, it makes me very happy."
The stunning actress then posed for the cameras alongside her co-star Jason, and spoke about how much fun the pair had had on set.
"I love teaming up with Jason, always," said Jennifer. "I've done it now three times and I plan on doing it again. It's totally fun."
Director Rawson Marshall Thurber credited the pair's friendship to their success on-screen.
"They have a lot of chemistry," said Rawson. "I think it comes from their personal life because they're such good friends. They're both so talented and they play off each other really well. Jen and Jason — they're a dream come true."
Jennifer laughed off rumours that she was pregnant with her actor fiancé Justin Theroux at the film's New York premiere earlier this month, when she stepped out in a purple dress that showed off her curvier than usual figure.
"There's nothing to announce. That's just a couple of pounds," she said, during an interview on Australia's Kyle and Jackie O Show.