Matthew McConaughey and Woody Harrelson might be even closer than they think.

After all, the Dallas Buyers Club actor recently caused a stir with the jaw-dropping revelation that he and his longtime friend Woody could actually be related as half-brothers. Until now, Matthew believed he was born to Mary McCabe and James McConaughey in 1969, whereas Woody was born to Diane Oswald and Charles Harrelson in 1961. However, Matthew is questioning whether Charles, who died in 2007, might have been his father, too.

"Where I start and where [Woody] ends, and where he starts and I end, has always been like a murky line," Matthew said in an April 11 episode of the Let's Talk Off Camera with Kelly Ripa podcast, per Variety. "And that's part of our bromance, right? My kids call him Uncle Woody. His kids call me Uncle Matthew. And you see pictures of us and my family thinks a lot of pictures of him are me. His family thinks a lot of pictures of me are him."

Their similarities were further brought into question when Matthew's mom, a 91-year-old author, dropped a bombshell that she knew Woody's dad, who was a convicted hitman.

"In Greece a few years ago, we're sitting around talking about how close we are and our families," Matthew added. "And my mom is there, and she says, ‘Woody, I knew your dad.' Everyone was aware of the ellipses that my mom left after ‘knew.' It was a loaded K-N-E-W."

The eyebrow-raising comments prompted a family investigation into the matter.

"We went on to unpack what this ‘knew' meant and did some math and found out that [Woody's] dad was on furlough at the same time that my mom and dad were in their second divorce," Matthew explained. "Then there's possible receipts and places out in West Texas where there might have been a gathering, or a meeting, or a ‘knew' moment."

Matthew and the Hunger Games alum have not yet taken a DNA test to settle the matter once and for all, and it looks like it might not happen anytime soon.

"Look, it's a little easier for Woody to say, ‘Come on, let's do [DNA tests],' because what's the skin in it for him?" Matthew said. "It's a little harder for me because he's asking me to take a chance to go, ‘Wait a minute, you're trying to tell me my dad may not be my dad after 53 years of believing that?' I got a little more skin in the game."

For more stars who share a familial connection, keep reading...

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Johnson got emotional when she presented an award to Banderas at the 2019 Hollywood Film Awards.

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The rapper and Fast & Furious franchise star is cousins with the R&B singer thanks to her stepfather, Reverend Edward Best, who happens to be Luda's uncle.

The late-night host and the Rescue Me creator are third cousins.

The onetime Grey's Anatomy doc has called the legendary director stepdad ever since he married her mom Kate Capshaw in 1991.

The Grown-ish star calls the rapper her second cousin. She was even the flower girl in his 2005 wedding with now ex-wife Kelis!

The star of The Politician is also the daughter of the Back to the Future icon.

Not only did the Veep vet make a name for herself playing a famous daughter on the HBO comedy, but she's also a famous daughter in real life. The erstwhile Jack Bauer star is her father.

Some Emily in Paris viewers were très shocked to discover Lily is the daughter of the English Grammy winner. 

The comedian and the New York Senator are actually related, as he's the first cousin of her father.

According to a 2014 People interview, a family historian from Ancestry.com claimed that the Fannings and the Duchess of Cambridge are all descendants of King Edward III, who ruled England from 1327 to 1377, making them very distant relatives—21st cousins, to be exact.

The actors are actually brother and sister!

The SNL alum calls the Cheers icon Uncle George whenever he seems him. At least, we assume he does.

Yep, Game of Thrones' Stannis Baratheon is the real-life dad of Fear the Walking Dead's Nick Clark.

The brunette beauty and the soulful "Stay With Me" crooner are third cousins. During a radio interview, Smith admitted that the pair have never met because their family is "huge."

The Salt actor and the memorable Law & Order: SVU guest star are half-brothers.

You may not have guessed but the Bridesmaids comedian and The View co-host are cousins.

The gorgeous British model is the eldest child of the Bush lead singer. The father and daugher first met when Lowe was 14 after she requested a paternity test. 

The We're the Millers actress has the perfect mentor in the Pretty Woman star, who happens to be her auntie.

Who knew the stunning Dancing With the Stars pro is second cousins with the Friends star?

The sexy True Blood vampire caught the acting bug from his dear old dad who stars in both The Avengers and Thor franchises.

The Ghost Rider actor comes from an extremely talented family. One of his cousins directed The Bling Ring, the other starred in Saving Mr. Banks and his uncle directed The Godfather.

The outspoken British singer is the older sister of the Game of Thrones star. She even wrote a song about him titled "Alfie."

 

The Damages star and the Lipstick Jungle actress are second cousins.

The Secret Life of Walter Mitty actress originally inspired her baby brother to get into show business.

The gorgeous Parks and Recreation actress is the daughter of the legendary music producer.

The Lost actor has a very famous cousin in the Mission: Impossible action star.

The "Drop It Like It's Hot" rapper is first cousins with The Game actress and her brother, Ray J.

The Anger Management star is the youngest brother of The Breakfast Club actor.