Chris Brown's ex-girlfriend Karrueche Tran has reportedly joined him on his 'Carpe Diem' tour.

The 'Don't Wake Me Up' singer - who recently rekindled his relationship with Rihanna and she allegedly had the word 'Breezy' inked on her skin to honour her on-off musician boyfriend, who famously calls his army of fans Team Breezy - is said to be in Paris with his model ex-girlfriend.

But according to gossip website, Karrueche is only with Chris, 23, for professional purposes as she is the designer of the clothing line 'The Kill' and has accompanied her brand partner Ugo Mozie, who is also Chris's celebrity stylist, on the trip.

The fashion guru - who also helped create the wardrobe for 'Sex and the City 2' - posted a picture of them arriving in Los Angeles International Airport for their flight to Paris.

Chris - who he is still on supervised probation for assaulting Rihanna in 2009 - has been inseparable from the 'Diamonds' singer, 24, recently, with Rihanna even flying out to Germany to spend time on tour with him, and the pair regularly post intimate snapshots of each other on Twitter.

The singer dumped Karrueche in September to concentrate on his friendship with Rihanna and reportedly gave her a generous payout following their split.