Rude run in with Rihanna… The First Lady on ‘Parks and Recreations’… Juan Pablo not welcome on ‘Dancing With the Stars’… Robin Thicke says “I’m just trying to get her back”… and Ashton Kutcher and Mila Kunis are engaged

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If you’re a fan of Downton Abbey, then you know Michelle Dockery who plays Lady Mary. She was on Chelsea Lately last night and they were talking about the last time they’d seen each other, which was in the bathroom at the Met Ball in NYC last year. Michelle recalled that Chelsea demonstrated proper bathroom etiquette, but on a second trip to the bathroom that night, Michelle said another celebrity wasn’t so polite. She said Rihanna pushed past all the ladies in line to get to the mirror and pretended to do her makeup, but she was actually just waiting for the next stall to open up and she cut in line. Rude.

FLOTUS Michelle Obama is going to be on the season finale of Parks and Recreation on April 24. She literally takes any opportunity promote her “Let’s Move” healthy-eating initiative and apparently they’re working it into a script for the show. The show is set in a fictional town in Indiana, which is number four on the list of our country’s obesity ratings.

Several sources have told E! News that Juan Pablo Galavais is persona non grata on Dancing with the Stars. Previous Bachelor and Bachelorettes have popped up on the dance floor in the past, but JP is getting so much negative press that they say he’s just too risky. But E! has learned that producers are in talks with Cody Simpson to join the cast for the show’s 18th season. Sources have said that NeNe Leakes and Candace Cameron Bure have already signed on. The official announcement will be made on Good Morning America this Tuesday. We already know Brooke Burke-Charvet was fired as co-host and that Erin Andrews is replacing her. And the bad boy dancer Maksim Chmerkovskiy — who left after season 15 — will be back to , with the new season premiering on Monday, March 17.

Robin Thicke canceled several concert appearances to try to woo his wife Paula Patton back, but finally the show had to go on! At his concert in Fairfax, VA, last night, Robin told the audience, “For y’all that don’t know me and my wife separated, but I’m trying to get my girl back. She’s a good woman.” Then he told fans that he’d written his song “Lost Without You” for Paula, which he then performed. Yes, Robin is still wearing his wedding ring. Paula reportedly is not.

E! News was the first to report that Ashton Kutcher and Mila Kunis is engaged. No confirmation from the couple or their reps, but Mila was photographed shopping yesterday wearing a huge diamond ring on THAT finger.