Heidi Montag debuted her new fashion range, Heidiwood, in Hollywood last week.

The Hills actress hit the catwalk in giant black stilettos, black hotpants and a skimpy black zebra-print  halter-neck top.

However, the real show-stopping moment of the night came when the 21-year old was surprised on stage by her boyfriend Spencer Pratt presenting her with two dozen long-stemmed pink roses.

The couple then put on a show for the cameras, kissing unashamedly in front of all and sundry.

Speaking about her on/off boyfriend, Montag told Us magazine: "I mean, you know, we're up, we're down. It's just the routine. The bottom line is that we love each other. We always have, and we're just trying to figure out our stuff like every other couple."

Click here to see pictures of Heidi’s fashion show, and that public smooch with Spencer.