The Oscar winner is a self-professed fan of Jenner's hit reality TV show Keeping Up With The Kardashians, and two of her girlfriends invited the family matriarch to the actress' 25th birthday earlier this month (15Aug15), as a surprise.

Lawrence tells The New York Times, "My two best friends planned a surprise birthday party with a big surprise within the surprise... They were singing Happy Birthday and Kris Jenner comes out holding my cake, which is a pile of s**t, with a sign that says, 'Happy Birthday You Pile of S**t'.

"My knees buckled. It was the closest I've ever come to losing consciousness. I had no idea!"

Jenner later posted a photo of herself and the birthday girl lying on a bed on Instagram.

She added the caption: "Happy Birthday you piece of s**t. God I love you #jenniferlawrence thanks for making this night a night to remember... even if we did get caught... I love you Happy Birthday Gorgeous!!!"

Lawrence continued to gush about her new pal, saying, "I'd never met her before but we’ve always watched Keeping Up With the Kardashians. And then Kris Jenner and I sang Build Me Up Buttercup on karaoke and took that picture."