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Matt Lanter, Angela Stacy

Byron Purvis/Ad Media/Sipa USA

Sorry, ladies: Matt Lanter is off the market.

He might play a rebellious womanizer on 90210, but in real life, he's a one woman man: E! News has learned that the 29-year-old actor recently proposed to his longtime girlfriend Angela Stacy!

Lanter popped the question to his love of three years during a romantic Paris vacation last month. He sealed the deal with a stunning solitaire 4.2-carat diamond on a diamond band.

One friend of the couple tells E! News, "They are perfect for each other."

For more on Matt and Stacy's engagement, tune in to E! News tonight at 7:30 and 11 ET/PT.

PICS: Celeb Weddings We Can't Wait For