Melissa Youssef, Miss Culver City in the Miss California Pageant, played a kid sister's role on the FOX reality show, "The Moment of Truth," earlier this year.

That's the show where contestants are hooked up to a lie detector and asked embarrassing personal questions. Grand prize is $500,000.

Melissa Youssef, who's pictured here, was not the contestant. Her older sister, Christie Youssef, was the one playing the game. But Melissa was on the show, too, with the TV cameras catching her reactions to her sister's answers.

At one point, Christie was asked: Do you think you're prettier than your sister?

She answered "yes" and the lie detector said that she was telling the truth.

Christie looked at Melissa and said, "Sorry." Melissa replied, "You can think what you like."

Christie, who is a former Miss California contestant, won $100,000 on the show.

Melissa said Friday that everything is good between her and Christie. "She's my best friend, but needless to say, we had an interesting conversation on the way home that day."

To see a clip of Christie Youssef being asked other personal questions on the show, click here.

Melissa performs tonight at Saroyan Theatre in the preliminary talent competition. She's a singer. She said Christie will be in the audience rooting for her.