Heidi Montag and her “Hills” co-star and real-life boyfriend Spencer Pratt are not exactly novices when it comes to mugging for the camera. But, they admittedly are not used to acting, which is why they were so excited to make their sitcom debut on “How I Met Your Mother.”

The couple taped a cameo for the sitcom on Wednesday — along with Kim Kardashian — for an episode set to air on January 12 at 8:30pm on CBS. “We are very excited to be on the show,” Montag told MTV News from the set.

“It’s the greatest show, besides ‘The Hills,’ on TV. It’s an honor and privilege. I like it here,” Pratt said. “This is our first cameo. We’re making history.”

The premise is that the reality-show couple is “featured on the cover of Them Weekly — a [tongue-in-cheek] reference to US Weekly — and we pop out of the magazine,” Spencer explained. They then taunt the show’s star, Jason Segel, over his “bathroom issues.”

The cameo gave the couple an opportunity to act in front of a green screen. “Heidi did a green screen for FNMTV with Pete Wentz,” explained chroma-key virgin Pratt. “It’s my first green screen, so [I’m] very, very nervous! I was told not to wear green, and green’s my favorite color.” Montag teased, “You’re green to it!” read the full story

“The Hills” are really alive, with the MTV reality show drawing its biggest audience ever this week.

Monday’s 10-11 p.m. episode, which was the first of Season 3’s eight “bonus” episodes, averaged 4.8 million total viewers, according to Nielsen Media Research. That marks the series’ biggest viewership ever for a single episode, besting what originally was supposed to be the third-season finale in December (4.7 million viewers).

On Tuesday, in its first full day live on MTV.com, the new “Hills” episode delivered 1.8 million streams, up 29% from the day after Season 3’s premiere episode.

Just a few weeks before the return of “The Hills,” MTV is giving fans a sneak peek at the hit reality series’ eight upcoming bonus episodes.

The episodes, which start airing March 24, will begin with co-stars Lauren Conrad and Whitney Port’s trip to Paris, where they travel to work for Teen Vogue. The new episodes also will continue the L.A.-based story line featuring couple Heidi Montag and Spencer Pratt.

“Hills” star Lauren Conrad announced that MTV was ordering eight additional episodes of the show during its live third-season finale December 11. That episode averaged 4.7 million total viewers, according to Nielsen.

Heidi Montag really is really living the American dream. She’s just a small-town girl from Colorado making it big on the blogs and getting the Maxim cover she’s dreamed of ever since the boys in high school called her a surfboard. It must be so awesome to be her!

This Maxim shoot isn’t all about the slutty pictures, though. Heidi’s got some things to say. Important things like L.C. has gone Hollywood and is “a big diva now.”

Somehow getting a nose job, breast implants, recent lip plumping and looking to parlay minor reality stardom into a viable singing career does not seem Hollywood to her.

And about the whole plastic surgery thing, Heidi has this to say:

It’s funny. Almost everyone on the show has had some kind of surgery. They were saying malicious things about me, and I was like, “You guys are hypocrites—trying to make me look bad when you’ve done things to yourselves!”

Juicy! Excuse us while we begin comparing before-and-after shots of Lauren…

By Dylan Vox
If you watch MTV’s silly reality show The Hills, then you are sure to recognize sexy hunk d’ jour Spencer Pratt, who is engaged to Laguna Beach alum Heidi Montag. This week the pretty boy was offered a role in the next film produced by gay adult film mogul Michael Lucas, who says the stud was simply made for gay porn.The Hills is a low rent reality fare that chronicles the life of Lauren Conrad and her pals as they work their way through the Hollywood circuit. Montag began living with Conrad in 2006 and struggled with her relationship with long-term boyfriend Jordon eventually breaking off the relationship for Pratt.