Britney Spears is having trouble keeping a lid on her random thoughts and let go another outburst on stage on Monday night. 

The singer - who is currently wowing fans in Houston with her Big Top bonanza - blurted out "B*tch!!" during her mimed performance of the 2003 hit Toxic.

Britney also confused fans recently when she wished them all a "Merry Christmas" on the Washington leg of her tour.

Prior to that, she shocked a Florida audience when a microphone malfunction resulted in the pop star announcing to thousands that her "p*ssy" was hanging out.

Meanwhile, Britney is said to be taking the edge off her intense work load with a some romantic light relief with one of her backing dancers.

See Britney's latest outburst below