While Austin Mahone was on tour, the 18-year-old had a very special guest in the audience: Fashion Police star Kelly Osbourne.

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Osbourne was a guest at Mahone's Los Angeles show last week. On Thursday, Mahone posted a pic from that on Instagram and wrote "Thanks @kellyosbourne for coming thru to the show! Hope you had a good time :)".

Osbourne had posted a similar pic on July 30 and wrote, "Back stage with @austinmahone can't wait to see him hit the stage!"

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Mahone has been having a crazy week on tour. Last night, Mahone with his openers The Vamps, Fifth Harmony and Shawn Mendes were in Utah and tonight they'll be in Colorado. "It's going great and I'm having a lot of fun," Mahone told Just Jared Jr. on Monday. "We have a ping pong table and a basketball hoop, so we're always playing around and having a good time."

They even have their pre-show rituals already. "We get into a group prayer and we all say a few words," he said. "And then we go out there and kill it. I drink a lot of water to stay hydrated and stuff. Nothing too crazy."

Next up for Mahone is the Teen Choice Awards on August 10 in Los Angeles. "There's not one in particular," Mahone said about winning a TCA, "but it would be cool to go home with one.

Tags: austin mahone Kelly Osbourne