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OTRC: Kelly Osbourne's massive ring sparks engagement rumors

Kelly Osbourne appears in a photo posted on her official Twitter account on June 4, 2012. (Lockerz.com/s/214395185)

Kelly Osbourne sparked rumors, donning a massive sparkling ring on her engagement finger at the Miss USA pageant on Sunday, June 3.

Osbourne donned a glittery silver Vivienne Westwood gown during the ceremony, where she served as a correspondent. But it was the glittering diamond that led to speculation by UK's Mirror that she had gotten engaged to her boyfriend, vegan chef Matthew Mosshart.

The 27-year-old British host's rep told OnTheRedCarpet.com that Osbourne is not engaged. The ring is a Palladium Ring by Todd Reed.

Osbourne has kept her new relationship quiet. She split from her fiance, British model Luke Worrall, when she discovered he was cheating on her in July 2010.

Miss Rhode Island, Olivia Culpo was named Miss USA 2012 at the pageant, which was held at the Theatre for Performing Arts in Las Vegas, Nevada.

Osbourne has in recent years evolved from a foul-mouthed teenager on her rocker father Ozzy's reality show "The Osbournes" into a fashion icon. She is one of the panelists on the E! series "Fashion Police," critiquing celebrities' fashion choices.

Kelly was a contestant on season nine of "Dancing With The Stars." The reality star was partnered with Louis Amstel and took third place. She also credited the dancing competition series with her impressive weight-loss.

Osbourne was also the face of the Spring 2011 collection of Madonna and Lourdes Leon's Material Girl line, replacing "Gossip Girl" actress Taylor Momsen.

Osbourne's brother Jack welcomed his first child, a daughter named Pearl, with fiance Lisa Stelly in April.

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