Did Iggy Azalea just fail at lip-syncing? The "Fancy" was recently accused by Radar Online of botching her lines at the June 14 B96 Summerbash concert with JLo.

However, the Australian songstress sets the record straight... and teases a few surprises about the expanded re-release of "The New Classic."

JLo surprised fans at the B96 Summerbash in Chicago by bringing Azalea onto the stage for a special performance in June. However, moments after the two ladies started in on their duet "Acting Like That," it became clear that the performance was not going as planned.

When the time came for the Australian hit-maker to launch into her lyrics, she simply didn't. JLo appeared visibly confused throughout the song, particularly as Azalea swayed to the music when a backing track could be heard blaring to the crowd. But Azalea kept her cool, waving to fans but not even lifting the microphone to her mouth.

Later, the musician explained the situation to fans via Twitter.

I was supposed to sing actin like that with JLo at summer bash today but some idiot handed me a microphone that wasn't even turned on