Adele wasn’t feeling her best as she posted a video to apologise to fans over having to cancel a concert on Wednesday evening.

The British singing sensation was forced to pull out of her second concert in Phoenix, Arizona, due to a nasty cold, and it’s clear to see she was absolutely gutted.

Taking to Instagram, Adele apologised saying, "I can't do my show tonight. I'm really, really sorry."

Going make-up free in the apologetic video, and with a bit of a red nose, the 28-year-old looked markedly different from her usual self.

Despite the low-key look, fans were quick to tell her how beautiful she looks without a scrap of make-up on, the comments under her video pouring in with praise.

One fan wrote, on Instagram: “You are so beautiful.”

Another added “Get well soon beautiful woman” and also advised her to drink plenty of lemon, ginger and honey tea.

Twitter was also awash with kind remarks for the Someone Like You hitmaker, with one young man admitting that Adele is “the most beautiful woman I have ever seen, and I’m proud to have a crush on you”.

Adele was due to appear for a second night at the 18,000-seat Talking Stick Resort Arena in the US city as part of her sell-out 2016 world tour.

In the video, she told fans: “I’m really, really sorry. I’ve had a cold for a couple of days and I’ve been pushing through it.

“I did my show last night and I loved it but I pushed too hard and my cold has gotten the better of me.”

AdeleAdele is known for her trademark make-up style (Ian West/PA Wire/PA Images)

The Hello singer, who is due to perform two concerts in Los Angeles this weekend, told fans she would reschedule the postponed show.

She added: “I’ve enjoyed my tour so much and cancelling shows has not been something I want to do.

“I’m so sorry to let you down. I know lots of people will be flying in from all over. It’s the last thing I want to do but I have to look after myself because I’ve got so many more shows to do.

“I will reschedule this show, I promise you. And I will come back and I’ll smash it for you.”