Credit: News Online

Surf's up, Mother Monster!

Lady Gaga went surfing in Puerto Vallarta, Mexico on Tuesday. The 25-year-old "You and I" singer showed off her svelte figure in a tiny black bikini.

"Yeah, that's me," she tweeted Thursday, along with a picture of her hitting the waves. "No heels, baby!"

So how does Gaga (real name: Stefani Germanotta) stay so trim? She told Sirius Morning Mashup in February: "I am on the drunk diet... I like to drink whiskey and stuff while I am working. But the deal is I've got to work out every day, and I work out hung over if I am hung over. And it's about the cross-training and keeping yourself inspired. I have to say, I do a ton of yoga."