"Heroes" stars Hayden Panettiere and Milo Ventimiglia are girlfriend and boyfriend, a source told People magazine.

"Hayden's mom adores Milo. She thinks he's so cute," a family friend told People. "She tells her friends that he's her boyfriend. She's very proud."

On a December trip to New York City, Ventimiglia — who is 12 years older than 18-year-old Hayden — hung out with the entire Panettiere family. "He's even met her grandparents. He fits in perfectly with the family. Milo jokes around with her little brother," says the source. "They're buddies."

A rep for the actress told People: "We do not respond to inquiries from the media regarding Ms. Panettiere's personal life."

The two had previously denied rumors that they were dating.

Click here for the People report