Demi Lovato and Ariana Grande are set for an appearance on "RuPaul's Drag Race" Season 7 as guest judges.

According to ET Online, the pop stars will be joined by Mel B to help determine which drag queen will win the competition. The other guest judges this season include John Waters, Kathy Griffin of "Fashion Police," Olivia Newton-John, Alyssa Milano, Kat Dennings, singer Jordin Sparks, Tamar Braxton (the inspiration for former contestant, Roxxxy Andrews), Rebecca Romijn, Santino Rice, Isaac Mizrahi, Michael Urie, Rachael Harris, Lucian Piane, and Merle Ginsberg.

In addition to Michelle Visage and RuPaul as the permanent panel, the upcoming season will also feature two new full-time judges: Ross Matthews of "Chelsea Lately" and Carson Kressley of "Queer Eye for the Straight Guy," the news outlet noted.

"I asked for a new, wickedly funny, smart and experienced judge...and I got two," said executive producer RuPaul, as quoted by a report from Variety. "Ross and Carson are the perfect addition to the 'RuPaul's Drag Race' family because they're not just showbiz experts, they're super-fans and longtime lovers of the art of drag."

Matthews also expressed his excitement as one of the judges for the upcoming season. He said, as quoted by E! Online, "I have never been more qualified to do anything in my entire life. As quite possibly the biggest super fan of 'RuPaul's Drag Race' in the entire galaxy, I take my position as a judge very seriously and will proudly serve as a voice for my fellow super fans-albeit, a very high-pitched voice."

The new season of "RuPaul's Drag Race" will premiere on March 2 at 9 PM on Logo TV. Watch the trailer for the show's seventh season below.

Demi Lovato Topped CNN's List of Mental Wellness Warriors

A few weeks ago, Lovato was named as CNN's top mental wellness warrior. She is known for being an advocate of mental health awareness and in discussing her bipolar disorders openly with the public.

"I want to show the world that there is life -- surprising, wonderful and unexpected life -- after diagnosis," she said, as quoted by CNN.

In September 2014, the former Disney star attended the National Alliance on Mental Illness' (NAMI) "Call to Action" day, where she told the audience about her advocacy of mental health reform, the news outlet noted.

"Those of us here today know that mental illness has no prejudice. It affects people of every race, age, gender, religion and economic status. We need to send the simple message to our nation's leaders: Mental health matters and must be taken seriously," Lovato said, as reported by CNN.