He'll also chat with Degeneres, so his controversial performance at last week's American Music Awards will likely come up.
Lambert made the biggest headlines at the AMA's with his showstopping, eyebrow-raising aggressive sexual performance of the title track from his debut album, "For Your Entertainment."
The male-to-male kissing and S&M overtones drew more than 1,500 complaints from viewers, according to MTV.com.
Talking to "American Idol" host Ryan Secrest on his radio show the day after the awards, Lambert made no apologies and said there's a double standard when it comes to risqué performances by men and women in music.
"I performed," Seacrest. "It was late-night TV. I did something that female performers have been doing for years, no different. "It's just the fact that I'm me and it's a little different for people. It's really not that big of a deal. I'm not a babysitter. I'm a performer."
You can see Lambert on the Ellen Degeneres Show at 3 p.m. PT.