Lady Gaga steps out of a translucent egg to perform her new song "Born This Way" at the 53rd annual Grammy Awards in Los Angeles, California February 13, 2011. [China Daily / Agencies]

Lady Gaga's "Born This Way" has become the fastest-selling single ever on Apple's iTunes store worldwide, racking up more than one million downloads in five days, Apple said on Friday.

Apple said the song -- a Madonna-influenced dance track that the 24 year-old singer performed after "hatching" from a giant egg at the Grammy Awards -- had hit the No. 1 spot on iTunes in 23 countries.

"Born This Way", the title track of a new album to be released in May, also went straight to the top of the U.S. Billboard Hot 100 singles charts earlier this week.

The flamboyant performance artist also revealed her secret for staying so thin, and how she gets her creative juices flowing.

"I am on the drunk diet," she told Sirius XM radio on Friday.

"I live my life as I want to, creatively. 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," she added.

The singer said in a television interview last weekend that she also smoked marijuana while writing her songs.

After headline-grabbing outfits, live performance stunts and a best-selling tour, Lady Gaga may be turning her thoughts to a possible new career -- in movies.

Asked if she saw herself becoming an actress, she told Sirius XM ; "I think at some point, yes. I think I'm sort of destined for that screen at some point."

But if there was a movie of her life, Lady Gaga said she would like to be played by Marisa Tomei -- the Oscar-winning actress from "My Cousin Vinny".

"I am such a Marisa Tomei fan. All my friends call me Marisa when I get angry. Because my New York accent just flies out of my body and I start smacking my gum," she said.