Chuck Liddell and Heidi Northcott: Engaged!

By unanimous decision, former Ultimate Fighting champ and Dancing with the Stars contestant Chuck Liddell has pinned Heidi Northcott ... for life!

Liddell popped the question to Northcott, his girlfriend of over a year, after a helicopter ride to the Grand Canyon back on November 4. Romantic!

This will be the first marriage for both Liddell and Northcott, who met through a mutual friend at a party. They have not yet set a wedding date.

UPPER-CUTT: Chuck Liddell has locked down Heidi for good!