Miley Cyrus's 'Bangerz' tour is quickly becoming known for its raunchy behaviour rather than the actual singing.

The 21 year-old pop-star hit the headlines again due to her provocative actions...again.

Cyrus's gig in Milwaukee this past Sunday (March 9th), will be remembered for not her performance, but an apparent missed costume change.

The 'We Can't Stop' singer had to perform the track '23' in just her underwear, although the crowd did not know why this was, she quickly explained the situation on her Twitter account.

"Not a new outfit for 23," she tweeted. "I didn't make my quick change and I couldn't not come out for the song so I just had to run out in my undies."

The former Disney teen star continued, "Never happened to me before. But I love my fans as much as they love me! I couldn't miss 23."

Adding, "Show must go on."

This adds to a long line of incidents that have occurred on her current tour, with the most well-kown being a moment of affection with a fellow pop-star.

Miley kissed Katy Perry in front of a sold-out Los Angeles crowd last month (Feb 22nd). The smooch occurred during Cyrus' show Staples Center, when Cyrus was performing 'Adore You.'

"I just kissed a girl and I liked it," she said to the LA crowd after the impromptu moment.

However, since the two singers' PDA moment, Perry has admitted that she wasn't expecting such a full on embrace from Cyrus.

"I just walked up to her to give her like a friendly girly kiss, you know, as girls do," Perry explained in an interview with Australia's 'Sunrise'. Adding, "And then she like tried to move her head and go deeper and I pulled away."

Read here about why Miley Cyrus' 'Bangerz' tour has already garnered requests to be canceled

"God knows where that tongue has been," she jokingly quipped. "We don't know! That tongue is so infamous!"

What will the 'Wrecking Ball' singer do next?