Austin Mahone has picked Rihanna as the celebrity tickling his fancy the most at the moment.

The US star told Capital FM that the 'What Now' star is the famous female who sends him weak at the knees.

When asked if had a boyhood crush, Mahone said:

"I don't know about a childhood crush, but my crush right now is Rihanna!"

He continued: "I love her. She was [my screensaver], but then I saw her at the iHeart Awards and I didn't want to be like, 'Hey, can I have a picture?', and then her see my background. I changed it that day just in case I saw her, I didn't want her to think I was crazy. She was cool. She's a ten."

Mahone meanwhile is due to release the single 'MMM Yeah' in the UK on June 22.

The singer is then set to play his first ever headline UK show at the Indigo2 in London on June 23.

Watch Austin Mahone in action below: