Leah Messer and estranged husband Corey Simms have had a tough few months. But on May 5, they got terrific news: A doctor told them daughter Aliannah, 17 months -- who has had difficulties developing physically -- will walk.

"She'll just be a little slower to start," a source tells the new issue of Us Weekly (on stands now).

For more details on the Teen Mom 2 couple -- including how they're treating each other in the wake of Messer's April 14 divorce filing -- check out this week's Hot Stuff video, as explained by Senior Editor Ian Drew and Jerseylicious stars Olivia Blois Sharpe and Tracy DiMarco, whose new season premieres May 15 on the Style Network.

Also in the roundup: Loveline radio host Mike "Psycho Mike" Catherwood ditches Dancing With the Stars' Lacey Schwimmer for Cheryl Burke, Mariah Carey gets her hair touched up after giving birth, and much more!