The couple have jetted off to celebrate Kylie’s never-ending 18th, and Tyga’s ex isn’t at all bothered – can’t you tell?

Kylie Jenner and her boyfriend Tyga are rumoured to have jetted off to Mexico together to continue her 18th birthday celebrations – and his ex Blac Chyna is keen to prove she’s not a bit bothered.

And what better way than by flaunting her unbelievable bum in racy selfies?

Model Blac Chyna posed up in some skimpy underwear for her latest racy photos, showing off her eye-popping behind and cleavage in all its glory.

Posing in the mirror, she flashes her extensive tattoos giving a good look at every angle – not a bit bothered about her ex’s whereabouts.

She captioned it: “A well-spent day brings happy sleep … Good night.”

Another shows her in a jacuzzi/shower, holding her head as she poses with her back to the camera in the tiny knickers.

With her hair flowing down her back – it’s obvious exactly which body part she’s keen to put on display for the world to see.

This time Blac wrote: “Late nights & Early mornings.”

Keeping Up With The Kardashians star Kylie and her other half Tyga have reportedly flown to Mexico to carry on the party under the sun.

The day after her birthday the 18-year-old shared a picture of a gleaming white private jet next to her white $295,000 Ferrari, gifted to her by the rapper, parked in front.

She simply captioned the picture: “Gone.”

The pair have jetted off to Mexico to relax in the sun for a few days without any family members, reports E! Online.