Credit: Larry Busacca/Getty Images; Stephen Lovekin/Getty Images

Hilaria Thomas has won over the Baldwins.

The 28-year-old beauty, who began dating 30 Rock's Alec Baldwin in May, is "very humble, very sweet, very down-to-earth and very charming," says Alec's brother, Stephen, 45.

"Alec's taking it slow. So far so good," Stephen told Us Weekly at SiriusXM's launch party for Studio 54 Radio in NYC Tuesday. "I think he's very intrigued at this point."

According to Stephen, his brother, 53, is "looking better than ever" now that he's shacking up with the yoga instructor in NYC. "When you're looking good it's because you're feeling good, so kudos to Hilaria," The Flyboys star explained.

"I'm glad that they're into each other," Stephen added, telling Us: "Alec's a lot calmer and a lot happier."