Matt Lanter (R) and Angela Stacy attend the VIP Opening Reception For Style Fashion Week LA And Major Donor Appreciation Night For Hollywood Arts at a private residence on March 11, 2012 in Bel Air, California. Credit: Amanda Edwards/Getty Images

Sorry, ladies: Matt Lanter is off the market.

The 90210 heartthrob, 29, asked his girlfriend of three years, Angela Stacy, to be his wife in Europe last month, his rep confirms to Us Weekly. "They're an amazing couple!"

This will be the first marriage for both. (E! News was first to report the couple's happy news.)

"Matt picked out and designed the ring himself. It's gorgeous!" a source tells Us. "Completely diamond encrusted with a solitaire, square-shaped diamond. They're super happy and she loves the ring."

Like Lanter, Stacy hails from Ohio. The Stark State College alum currently lives in L.A., where her fiance shoots 90210; Lanter also voices Anakin Skywalker on Cartoon Network's popular animated series, Star Wars: The Clone Wars.

According to her Twitter page, Stacy describes Lanter as her "very best friend and the love of my life."

In addition to 90210, which will return for a fifth season this fall on The CW, Lanter's film and TV credits include Vampires Suck, Commander in Chief, Disaster Movie, Liars All, The Roommate, Sorority Row and The Cutting Edge 3: Chasing the Dream.