Watch: Jason Segel Hits On Leslie Mann In New 'This Is 40' Featurette

nullWhile Seth Rogen and Katherine Heigl won't be back for Judd Apatow's "Knocked Up" spin-off "This Is 40," one person who was revealed to be returning as far back as the summer of 2011 was Jason Segel. And once again, he's back and still obsessed with Leslie Mann.

As the film gears up for the awards season and its theatrical bow, a new featurette has come online focusing on Segel's return. And if anything, it emphasizes Apatow's trademark loose filmmaking approach, which allows for a lot of improv and in-the-moment inspiration to be part of the process. Of course, Leslie Mann's Debbie is flattered by trainer Jason's attention, particularly as she's turning 40 and she begins to question her own beauty, especially when faced with Megan Fox's youthful body.

Take a look below — "This Is 40" opens on December 21st. [Huffington Post]