The yoga instructor "lights up the room," a source tells PEOPLE

By Charlotte Triggs
Updated April 04, 2012 05:15 PM
Credit: Andrew Toth/

Alec Baldwin is headed to the altar with his new fiancée, Hilaria Thomas, and friends of the 30 Rock star aren’t surprised.

“She makes him so happy,” says a source close to the couple. “She’s a great person. Her smile is contagious. She makes everybody feel welcome and warm whenever she is around.”

Thomas, a 28-year-old yoga instructor in New York City, is also perhaps the antithesis of Baldwin’s former loves.

“She’s still teaching classes – the day after the news that she was engaged, she was out teaching a class,” says the source. “She’s very real. She’s not a showbiz type at all. She’s humble.”

And friends have noticed a change in Baldwin, 54, since the two began dating. “He’s just really happy,” says the source. “They light up the room whenever they are together.”