Milo Planning Panettiere Proposal?

Heroes star Hayden Panettiere is set to hear wedding bells in her future after boyfriend and co-star Milo Ventimiglia was spotted ring shopping.

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.