HALO -- It's Official!

Hayden Panettiere and Milo Ventimiglia are officially an item, reports People.

And if it’s been published in People, it’s a fact!

“Hayden‘s mom adores Milo. She thinks he’s so cute,” a family friend says. “She tells her friends that he’s her boyfriend. She’s very proud.”

The source adds, “He’s even met her grandparents. He fits in perfectly with the family. Milo jokes around with her little brother [Jensen].”They’re buddies.”

It was pretty much official after video footage of Hayden, 18, and Milo, 30, dancing up on each other leaked onto the Internet. Kinky!