John Stamos dropped by to see his old friend Jimmy Fallon last night on "The Tonight Show." The 52-year-old actor discussed the upcoming Netflix series "Fuller House" and threw some shade at Mary-Kate and Ashley Olsen, the only original "Full House" actors not returning for the show's reboot.

Stamos told Fallon it was "so fun" reuniting with the cast of "Full House" for the new series. Andrea Barber, Candace Cameron Bure, Dave Coulier, Lori Loughlin, Bob Saget, Jodie Sweetin, Blake Tuomy-Wilhoit, Dylan Tuomy-Wilhoit and Scott Weinger are all returning for the Netflix series, but the Olsen twins are not.

"It was just like a family reunion where some of the family members didn't show up," the actor told Fallon with a smirk on his face. See the video of this portion of Stamos' interview below.

Earlier yesterday, Stamos opened up to Howard Stern on Sirius XM Radio about what happened with the Olsen twins and why they decided to not partake in the show.

"I think there was some confusion. They said first I didn't ask them. And I didn't personally, but I was told they were asked," he said of the sisters. "So, I had a knee-jerk reaction and said, 'Bulls--t, I did ask them.' And they got upset, so I did call and talked to Mary-Kate and explained what the show is going to be and told them I'd love for them to be on there and they decided not to, which I respect."

Stamos added in that the Olsen twins were "very sweet" about the offer to return, but declined the opportunity to get back in front of the camera.

"They just were afraid of acting," said Stamos. "They don't consider themselves actresses."

"Fuller House" premieres Feb. 26 on Netflix, as HNGN previously reported.

Listen to Stamos' interview with Stern below.