Alec Baldwin: Why He Fell for Hilaria Thomas
04/04/2012 AT 05:15 PM EDT
"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."