Pop star Lady Gaga had an embarrassing moment when she tripped over the train of her long dress and fell onstage while performing with her collaborator Tony Bennett in Monaco.

The singer was performing on `Anything goes` with Bennett when she took a tumble in front of the crowd at Salle des Etoiles, Monaco last weekend, reports aceshowbiz.com.

In a video taken during the show, Gaga is seen in a long gown while singing alongside Bennett and she was walking on the stage when she tripped over the train of her dress and fell on her knees.

However, the `Bad romance` hitmaker quickly got straight back up and continued with her gig.

The Monaco show was part of the European leg of Gaga and Bennett's "Cheek to Cheek" tour, which was launched to support their 2014 joint album of the same name.

The tour will be brought back to North America later this month before being wrapped up in early August.