Turns out Rihanna has a seriously bad habit we knew nothing about

'My mom is gonna see this. Sorry, Mom.'

Just when you think you know Rihanna, she reveals something totally surprising about herself.

The Fenty Beauty mogul appeared on The Graham Norton Show along with her fellow Ocean's 8 cast members, during which host Graham Norton revealed a pretty unusual bad habit she has.

Numerous paparazzi shots of Ri Ri out and about show that she has a bit of a stealing problem – of wine glasses, in particular.

Norton proceeded to show a slideshow of pictures of Rihanna leaving various venues, glass in hand, and it certainly seems to happens on the regular.

'That might have been one that I took to the club,' she said of one of them, and 'I took that back to the hotel that I took it from' about another.

In fairness, her intentions don't seem to have anything to do with the glasses themselves. Girl's just gotta finish her drink.

Watch the full clip from last Friday's episode below.

While we love the idea of her being a secret thief, it doesn't exactly look like Rihanna was trying to smuggle the goods out – the hotels and restaurants probably had no qualms about a Grammy-winning artist taking one of their glasses.

In fact, the only thing the star seemed bothered about was the fact her mum was going to see the interview...

Oh Ri-Ri. What are you like.