Credit: Jeff Kravitz/FilmMagic

Sandra Bullock is kissing and telling about her surprise smooch with Scarlett Johansson at the MTV Movie Awards Sunday.

"Ryan is right -- Scarlett is a great kisser," she tells exclusively.

Johansson, 25, filled in for husband Ryan Reynolds (who costarred with Bullock in last summer's The Proposal and couldn't attend the show) to present Bullock, 45, with the Generation Award -- along with Bradley Cooper and Betty White.

Bullock and Reynolds were up for Best Kiss.

"I thought you should have was a great kiss," Johansson told her.

They then slowly worked their way towards each other and locked lips as the crowed cheered.

During her acceptance speech, Bullock also took time out to tell the audience that she loves acting and has no plans to quit. "No matter what you might have seen or heard or read lately, I love what I do. And I'm not going anywhere," she said.