Matthew McConaughey at Mud Premiere at Sundance 2013

Matthew McConaughey was still looking lean, but clearly has been working to put back on the pounds as he premiered his movie Mud at Sundance on Saturday night. Reese Witherspoon, Matthew's leading lady in the film, didn't join him for the Park City, UT, red carpet. Matthew and Reese debuted their film in Cannes, and since then, it has been quietly gaining positive buzz and momentum. In recent months, the headlines about Matthew have been all about his weight loss for The Dallas Buyers Club, but this weekend, fans want to know about something else — his friendship with Lance Armstrong and his feelings about Lance's fall from grace. Matthew opened up a bit about his feelings of anger and disappointment in the wake of Lance's admissions. Matthew said that he was "pissed off" at Lance initially and that part of him took it personally, but then he felt sad when he watched Lance's interview.

We're on the scene at the Sundance Film Festival, so keep checking back for all the excitement and follow POPSUGAR on Twitter and Instagram for more!