Joe Manganiello spends most nights at Sofia Vergara's house.

The 'Magic Mike' star, who recently started dating the 'Modern Family' actress, has practically moved into the latina beauty's new $10.6 million mansion in California already, according to friends.

A source said: ''He spends most nights at her house [in Beverly Hills]. She's smitten. Joe is super romantic and sweet.

''Their relationship is moving pretty quickly, but I'm not surprised. They're crazy about each other!''

Sofia - who ended her engagement to Nick Loeb, 39, earlier this summer - is said to have no regrets about calling quits on the relationship.

The source told In Touch magazine: ''Nick was a little selfish and immature and they were always fighting.''