Boyzone’s Ronan Keating shocked shoppers with an impromptu performance inside a Tesco.

The singer brought an acoustic guitar to the Tesco Mobile store in Hemel Hempstead where he was filmed singing twists on some of his biggest hits.

In partnership with Tesco Mobile as its new roaming ambassador, he is apparently set to tour some more of the brand’s locations across the country to serenade customers.

Sharing a video to TikTok, one customer described the visit as “so bizarre” but added that she “loved it”.

In the clip he asked customers to tell him where they were off on their holidays before working Budapest into Lovin' Each Day, Barcelona into Life is a Rollercoaster, and Paris into When You Say Nothing at All.

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Not me doing my shopping and stumbling across Ronan Keating in Tesco Mobile Hemel Hempstead?!

♬ original sound - Lucie May

“Not me doing my shopping and stumbling across Ronan Keating in Tesco Mobile Hemel Hempstead,” the shopper added.

Herts Advertiser: Ronan Keating was also surprising Tesco customers with vouchers.Ronan Keating was also surprising Tesco customers with vouchers. (Image: Tesco Mobile)

The promotion was paired with Keating changing his name to ‘Roaming Keating’ on Instagram. It advertises Tesco extending its roaming deals for holidaymakers.

“I am very excited to kick off my work with Tesco Mobile as their new roaming ambassador, it feels I perhaps was born to play this role," the singer said.