“Heroes” actress Hayden Panettiere may soon hear wedding bells – her boyfriend (and co-star), Milo Ventimiglia, was spotted ring shopping, according to source

Friends insist the handsome star is so smitten with his teenage girlfriend that he’s planning a romantic proposal for later this year.

A pal tells In Touch magazine, “Milo was looking at rings in late June. He really likes Cartier and intends to spend around $200,000.”

Ventimiglia, 31, and the 18-year-old actress met and fell in love on the set of hit drama “Heroes.” They have been dating since the beginning of the year.