Actress Gia Mantegna has dismissed reports she's engaged to Mitchel Musso after the former Hannah Montana star told fans he'd bought his girlfriend a diamond ring.

Musso, 20, took to his page on Twitter.com last week to upload a picture of a sparkler, and told his followers, "Just got my girl the fattest diamond emerald cut fully covered wanna see it?? She loves it. Whatcha think?"
 
The post prompted gossips to speculate that Musso and Mantegna were set to wed, but the actress has taken to her own account on the site to brush off the rumors.

She writes, "Not engaged! mitchel musso just likes to spoil me silly."