'Friends' stars Matthew Perry and Courteney Cox are said to be distant cousins - and they're both related to Lady Gaga.

Matthew Perry and Courteney Cox

Matthew Perry and Courteney Cox

The pair are best known for portraying married couple Chandler Bing and Monica Geller in the sitcom, but according to researchers at online genealogy website MyHeritage, the co-stars are 11th cousins and share distant relatives, William Osbern Haskell III and Ellen Haskell.

Roi Mandel, the head of research at MyHeritage, told CNN: "We went into this line very deeply, we checked every name.

"We found a lot of records that support it, and we have confidence that they are related.

"This is not such a surprise. It makes sense that when you go so many generations back, the chances of people being connected are higher."

William and Ellen were married and lived in England around 500 years ago, and she emigrated to the US in 1635 with her two sons, Roger and William.

According to the ancestry experts, William is a direct ancestor of Matthew, 51, and Roger is said to be a direct ancestor of 56-year-old Courteney.

The research also found the 'Friends' stars are said to be distantly related to Gaga, who Courteney is known to be a fan of.

In 2012, she wrote on Twitter: "Of course I like Lady Gaga. Who doesn't love talent?! (sic)"

Chandler and Monica married in Friends' seventh series, and the couple became parents in the last-ever episode.

The cast of the sitcom - who also include Jennifer Aniston, Lisa Kudrow, Matt LeBlanc, and David Schwimmer - recently reunited to film a one-off special, 'Friends: The Reunion', in which they will reflect on their memories of the show.

Gaga will also appear in the episode, joining Lisa to sing her character Phoebe Buffay's song 'Smelly Cat'.

Director Ben Winston told Variety: "I said to Lisa, 'Would you be prepared to sing it?' and she was like, 'Yeah, that would be fun.'

"We went through a few names and we both agreed that Gaga, if we could get her, would be the ultimate one because she associates with and feels close to Phoebe in so many ways, as Gaga says on the show.

"That was a really beautiful moment, and Lady Gaga jumped at the chance to do it."