Watch Kelly Clarkson perform an epic music mashup at the Billboard Music Awards

Kelly Clarkson kicked off the Billboard Music Awards with a musical medley of the year's biggest hits.

The 'Behind These Hazel Eyes' hitmaker made her entrance to the MGM Grand Garden Arena in Las Vegas through the audience, taking a seat next to actor Terry Crews and discussing Taylor Swift and Brandon Urie's show-opening performance of 'Me!' before being ejected by former New England Patriots star Rob Gronkowski, who claimed he was a security guard and she was in a seat needed by Florida Georgia Line.

Watch Taylor Swift and Brendon Urie perform ME! at the Billboard Music Awards:

But when the country stars claimed they didn't recognise the evening's host, she said: "Oh, you got jokes, you got jokes? Okay. I'll prove it."

She was then joined by a guitarist and back-up singers and performed the duo's hit 'Meant to Be' before making her way to Ella Mai for a chorus of 'Boo'd Up'.

Watch Ariana Grande perform 7 rings at the Billboard Music Awards:

She then climbed on stage and was joined by dancers as she sang snatches of tracks including Maroon 5's 'Girls Like You', a country take on Zedd's 'The Middle', Calvin Harris and Dua Lipa's 'One Kiss', Panic! At The Disco's 'High Hopes', as well as an impressive take on Cardi B's 'I Like It', which featured male dancers with cash cannons and Kelly not only rapping but also tackling Bad Bunny's Spanish verse.

That wasn't Kelly's only musical performance of the evening because later in the show, she changed into a pink dress to sing 'Broken & Beautiful' from her new movie 'UglyDolls'.

Watch Kelly Clarkson perform Broken & Beautiful at the Billboard Music Awards:

And speaking ahead of the ceremony, the 37-year-old star - who was also host of the event in 2018 - had insisted she didn't feel nervous about any of her duties on the night.

She told E! News: "I'm not really nervous about either. Performing, obviously, is fun and I am doing 'Broken & Beautiful' from the UglyDolls soundtrack. And then I'm hosting! I just have fun with it. Hopefully they like it and if you don't, whatever. It's happening regardless."

Billboard Music Awards 2019 Winners:

Top Artist:

Drake