Usmagazine.com has learned exclusively that Spencer Pratt and Heidi Montag are engaged!

Pratt, 23, popped the question to Montag, 20, Tuesday night at the Bacara Resort & Spa in Santa Barbara, says a source who adds: “She said ‘yes.’ She’s over the moon!”

The Hills stars, whose controversial courtship was chronicled last season on the hit MTV reality series, have been dating for just eight months.

Pratt purchased the diamond-encrusted platinum band with a pink stone on Monday at Ice at Brentwood Gardens before presenting Montag with his bended-knee proposal, according to a source. An eyewitness at the store tells Us, “She was trying on tons of them and they looked really happy!”

Montag was formerly a close friend and roommate of her Hills co-star Lauren Conrad, 21, until Pratt earlier this year urged Montag to move out of Conrad’s apartment and in with him. The couple has not yet set a wedding date.

Just three weeks after her breast augmentation and rhinoplasty, Heidi Montag, 20, turned heads with beau Spencer Pratt April 22 on a Malibu beach.

“She looked awesome!” says an onlooker. “She seemed really happy.”

Sources say that Beverly Hills-based doc Frank Ryan did both surgeries. Montag always wanted C-cups, a pal tells Us.

“Whatever women need to do to feel sexy, they should do,” says Montag.

Though Montag has not confirmed she had surgery, she does admit she has plenty of reasons to be in good spirits.

“I’m in a great place in my life right now,” she says.

Pratt adds: “I would never tell her what to do with her body.”

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