From 80-year-old Cher and her toyboy boyfriend, 39, to singer Lana Del Rey marrying an alligator tour guide who is ten years her senior, showbiz fans delight in an unlikely couple.

The latest romance that no one saw coming is Justin Fletcher, 55, who plays Mr Tumble on CBeebies, and his 34-year-old co-star Samantha Dorrance.

The TV star, a self-confessed workaholic, has reportedly been living with her at his £2.5million Oxfordshire mansion after admitting he spent 20 years putting his career before relationships.

Their age gap and Fletcher's sparse romantic history contributes to the sense of surprise, but even A-listers of a similar age and status can surprise fans.

Some critics have been left 'utterly unconvinced' by the pairing of Kim Kardashian and Lewis Hamilton, labelling their relationship a ‘showmance’.

Others have, perhaps unkindly, been baffled by couples where one partner is perceived as significantly more attractive than the other.

As Justin's unlikely romance is revealed, the Daily Mail takes a look at some of the most surprising celebrity couples. 

So, who do you think are actually perfectly matched, despite the shock, and who still leaves you slightly bewildered by their pairing? Have your say below...