Fans in disbelief after spotting Billie Eilish’s mum in Friends episode

Fans of Billie Eilish are freaking out after learning her mum featured in perhaps the most well-loved sitcom of all time back in the 90s.

22-year-old Billie released her much anticipated album, Hit Me Hard and Soft, back in May.

It received widespread critical acclaim and cemented Billie as one of the greats, following up from the huge success of her past tracks including 'Bad Guy' and 'What Was I Made For'.

It seems fans can't get enough of Billie, whether they're obsessing over her very sapphic love song 'Lunch' after coming out in April, or meticulously keeping tabs on her love life.

She recently opened up about her split from 33-year-old Jesse Rutherford, amid cheating claims.

She said at the time: "That’s my guy, truly one of my favourite people in the world", so safe to say there's no bad blood.

It seems the Billie-mania has extended beyond her personal life and now encompasses the lives of her family, too.

Fans have been going well and truly wild upon learning that Billie's mum, Maggie Baird, appeared in an episode of Friends in 1999.

The episode, titled 'The One Where Joey Loses His Audience', sees Maggie portraying Casting Director 2, while Joey Tribbiani (Matt LeBlanc) auditions in front of her.

Maggie Baird appears in a scene of Friends. (Warner Bros)

The funny scene shows Joey losing out on a role he needed in order to pay for his medical care due to a painful hernia.

The pain means he can't lift the product, instead suggesting: "Or I could just point to it? Blah, blah, blah Purina One. Point to a bag today."

The footage has gone viral on social media and has now led many to label Billie as a nepo baby - a term short for nepotism baby, which refers to a successful child of well-established, famous or influential parents with industry connections.

One person wrote: "Ahhh so Billie IS a nepo baby."

Some people think Maggie's appearance on Friends makes Billie a nepo baby. (Todd Williamson/NBC via Getty Images)

Another said: "Sooo…. She didn’t just came out of nowhere… she’s an industry bby."

A third chimed in: "Y'all see her mom in a thirty second TV clip and oh my God they were rich and famous making their kids industry plants. Please be fr."

But in the most dramatic turn of events, Billie's brother, Finneas, also commented.

He said: "Ah yes, the classic, 1 day of work on 1 episode of friends to make someone rich and famous - the whole gag of this video is none of you had any idea at all who she was."

To which somebody praised: "You ate them up king."