Watch as Liam Payne is left red-faced by his girl

The One Direction hunk didn't quite know what to do with himself when he leaned in to smooch the 32-year-old singer and she turned him down while they were watching Rihanna perform at the Mandalay Bay Events Center in Las Vegas.

A concert-goer caught the awkward moment on camera as Liam, 22, lingered next to his partner while she completely blanked him and kept her eyes locked on the stage. 

Trying not to draw attention to the embarrassing blip, the handsome singer sat back in his chair and touched his face.

Meanwhile, the couple have only been dating 10 months but it seems their romance is progressing thick and fast as they've wasted no time taking things to the next level by moving in to Liam's lavish mansion in Los Angeles together.

A source said recently: "Cheryl and Liam are getting more serious by the day. They want to make the most of their time with each other before Cheryl has to go back to the UK, so it made sense for her to come and live with him."

And, although the couple both have busy careers to focus on, it seems things are getting so serious that friends are convinced it won't be long before there's a patter of tiny feet. 

The insider added: "They are so happy together. It is definitely the real deal. In fact I wouldn't be surprised if Cheryl had her first child with Liam."

Liam began dating Cheryl just a few months after her marriage to Jean-Bernard Fernandez-Versini, whom she got hitched to in 2014, came to an end but it wasn't until February that their secret romance was revealed.