Credit: NBC

Julianne Hough better watch her back!

During the red carpet pre-show at Sunday's Primetime Emmy Awards in L.A., Kathy Griffin made a move on the 23-year-old's boyfriend, E! News host Ryan Seacrest.

"Are you still banging the dancer?" Griffin, 50, asked. "How did you get her? You're with Julianne Hough! And you' What kind of smoke and mirrors game are you playing?"

Seacrest merely laughed and shifted the interview back to Griffin, noting that her lips looked "very, very red."

"Have you left a mark on anyone?" he asked.

It was then that Griffin -- clad in Oscar de la Renta -- seized her moment to smooch the TV host. "Oh, gosh," Seacrest, 36, groaned. "I don't really want this tape to exist."

"There," Griffin said. "I just sold my soul to the devil."

As Griffin walked away, Julianna Marguiles stepped in and came to Seacrest's aid, helping him remove the comedian's lipstick with a handkerchief. "I shouldn't be wiping your lips with a white dress on," she laughed.