VIDEO : Is Paris Hilton Engaged?

ET's Lauren Zima caught up with the cute couple at the Race to Erase MS Gala at the Beverly Hilton in Los Angeles on Friday, where they opened up about a possible proposal after Hilton arrived with a ring on that finger. EXCLUSIVE: Chris Zylka Gushes About His Perfect 'Soulmate' Paris Hilton: 'I'm the Happiest I Have Ever Been' "This is actually a gift from my friend, Rosalina," Hilton explained, before her beau added that the pair are "not yet" engaged. "You'll find out," Zylka teased.