(Cover) - EN Star Style - Khlo Kardashian was so proud after seeing sister Kim looking amazing in her Skechers Shape-ups commercial.

Kims raunchy advertisement for the footwear brand aired during the iconic Super Bowl National Football League (NFL) championship game last night, which saw the Green Bay Packers and Pittsburgh Steelers take each other on.

The 30-year-old beautys younger sibling Khlo, 26, was astonished to see her sister looking so good in the raunchy advert, and felt an immense sense of family pride.

Wow @KimKardashian looks so amazing in her shape up ads! I am so proud of her! Show them how its done baby (sic)! wrote Khlo on her Twitter page.

Kim was also discussing the commercial via her own page on the social-networking site. The gorgeous star received numerous celebratory messages for the advert, and despite being thrilled with the end result, admits she had been terribly nervous before it came on air.

I was so nervous to watch it! It turned out so fab (sic)! wrote Kim.

The socialite had previously discussed her worries about the advert. Although she knew she had done a great job, the beauty had been anxious some of the scenes were too seductive for television.

"There is a sexy guy... it gets pretty intense," she previously said. "Some of this might have to be cut out because it probably won't be able to air during the Super Bowl... Let's just say it gets a little sweaty and slippery. It's very provocative." (C) Cover Media