Funky hunky funnyman puts the twinkle back in SANDRA BULLOCK’s eyes!

 UNLUCKY-in-love Sandy is learning to laugh again – with help from her latest co-star, comic Bill Burr.

The “Blind Side” beauty, 48, be­came fast friends with Burr, 44, on the Boston set of their buddy com­edy “The Heat,” and pals fear the Oscar winner could be falling for him, even though he’s got a girl­friend.

“Sandy hasn’t laughed so hard or looked so good in years – and it’s all thanks to Bill,” an insider told The ENQUIRER.

“They’re constantly joking and cutting up together. Sandy says they bonded so quickly be­cause they’re both of German-Irish descent, and they get each other’s quirky sense of humor.”

In “The Heat,” Sandra plays an FBI agent forced to team up with a Boston cop, played by “Mike & Molly” Emmy winner Melissa Mc­Carthy, to bring down a Russian mobster.

“The crew nicknamed Sandy, Me­lissa and Bill the ‘Three Stooges’ because they’re a riot together,” the source said.

“One day Bill started throwing Doritos at the girls, and they retali­ated by lobbing apples at him!

“Another time he posted a sign on Sandy’s back that said, ‘Kick me, I’m a stuck up Hollywood b****.’ Sandy was completely clueless and walked around for hours while crew members snickered behind her back. Anyone else would have been furi­ous, but Sandy thought it was hilarious.”

Known for his ir­reverent riffs on feminism, Bill has appeared in the 2005 HBO series “One Night Stand,” and the 2010 Comedy Central special “Let It Go.” He’s also done his stand-up act on late-night talk shows and landed several TV guest spots, including a recurring role on “Breaking Bad.”

Meanwhile, AS THE ENQUIRER recently reported, Sandra was devastated when her one-time love Matthew McCo­naughey married Camila Alves in June.

And two years after divorcing cheating badboy Jesse James, she’s still undergo­ing counseling to deal with trust issues involving men. Now some fear she’s falling for Bill, who’s already seeing di­rector/producer Nia Hill.

“Nobody wants to see Sandy hurt again,” said the source, “but it’s just so good to see her beaming.”