Milo Ventimiglia has reportedly purchased “Heroes” co-star Hayden Panettiere an 18-karat gold ring. Although they denied the romance in several occasions, In Touch Weekly reports that the 30-year-old actor treated the 18-year-old actress with a Tiffany & Co. ring for her belated birthday. Milo had inscribed the $1,950 jewel with the saying “Sweet like Hayden.”