Rihanna goes shopping in a swimming costume - and has she been partying with newly single Lewis Hamilton?

Shoppers in Monte Carlo were treated to RiRi spending cash in her swimwear

Rihanna, just keeping it casual

We're used to seeing Rihanna wearing no clothes on Instagram, and even flashing us on stage, and we're really not complaining about that.
But shoppers in Monte Carlo were in for a treat when Rihanna decided to strut through a luxury shopping mall in nothing but a swimming costume and a lace shirt. Because of COURSE that's what you wear to spend your hard-earned money.

The singer was in Monte Carlo to perform a series of gigs, and last night treated herself to a little trip on a yacht to celebrate before she heads to Scotland to headline T In the Park this weekend.
She tweeted a series of pictures of herself and her mates on the boat - including a close up of her bum. We think she's trying to point out she's wearing her River Island line, but all we can see is her amazing bum.
Meanwhile, US reports say she was partying with newly single F1 driver Lewis Hamilton until 5am in a Monaco nightclub called Jimmy'z.

But where does she keep the change?

Goff Photo

The club's DJ says the pair were drinking and dancing together for over an hour. “Rihanna came to the club at around 3 or 3:30 and went right to Lewis’ table,” said the DJ at the club, Or’elle. “Rihanna requested that I play only hip hop, and she and Lewis were drinking, dancing and having fun. He came with his friends but when she arrived they were together. Rihanna stayed about an hour and a half with Lewis. By 5am she was gone from the club.”

So, new celeb couple? Lewis split from Nicole Scherzinger earlier this month - he revealed he was pretty gutted - and Rihanna and Chris Brown look like they're FINALLY over. Plus, Rihanna and Lewis would make a hot couple, right?
Lewis and Nicole have been sensible about their split so far - even agreeing to go to Wireless on different days - but who knows how the X Factor judge would feel if he moved on with Rihanna so quickly.