LOS ANGELES, Calif. -- Sandra Bullock knows why "The Proposal" was her biggest box office opening yet.
"I'm going to be naked in every single film," she joked on the UK's "GMTV" on Tuesday, referring to an awkward scene with co-star Ryan Reynolds. "Can you imagine me at 70? Zac Efron doing a big film - there I am, running naked in the background. Just back and forth until someone notices. Big box office - they're all going to want me in their film."
VIEW THE PHOTOS: Summer Movie Preview 2009
The romantic comedy topped the box office with $34.1 million after opening on June 20, beating Sandra's previous high water mark, 2007's "Premonition," by almost double.
And while the longtime star said she's ready to strip down again, she noted nudity works best at the box office when it's just for laughs.
VIEW THE PHOTOS: Photo Fun With Hollywood's Hottest Comedians!
"If you're naked and you're trying to be sexy - you don't really make as much money as if you're naked and you're funny," she explained, naming one actor as a master of the style. "Will Ferrell has been onto that for quite some time. Have you noticed how he drops his trousers in every single film? I'm going to do that from now on. Action film - all naked!"
Sandra will get another chance to show off her box office clout in her next film, September's "All About Steve," which will find her starring alongside "The Hangover" star Bradley Cooper.