AceShowbiz - Travis Barker is back onstage. More than two weeks after he was hospitalized for pancreatitis, the Blink-182 drummer made a surprise appearance at Machine Gun Kelly's concert at the Kia Forum in Los Angeles.

When introducing the drummer to the crowd, the singer/rapper said at the Wednesday night, July 13 show, "There's a person I grew up idolizing that I became friends with and he believed in me." He added, "And never more have I wanted to jam to a song that he and I created. L.A.'s own Travis Barker, make some noise for him tonight."

After Travis hit the stage, he and MGK performed "Bloody Valentine" and "Tickets to My Downfall" together. After delivering one song, the fiance of Megan Fox said, "You know a fun fact is that Travis is not supposed to be playing drums right now but guess what he's doing here? Playing drums right now!"

"Trav, I know we agreed to one song but I would be remised if I did not ask you to play one more song," the 32-year-old rocker then told his pal. Travis' wife, Kourtney Kardashian, reportedly also attended the show to support him.

Travis was rushed to Cedars-Sinai Medical Center in Los Angeles on June 28. Speaking of his health issue days later, the 46-year-old musician wrote on Instagram Story, "I went in for an endoscopy Monday feeling great. But after dinner, I developed excruciating pain and have been hospitalized ever since."

"During the endoscopy, I had a very small polyp removed right in a very sensitive area, usually handled by specialists, which unfortunately damaged a critical pancreatic drainage tube. This resulted in severe life threatening pancreatitis," the father of two added. "I am so very very grateful that with intensive treatment I am currently much better."