The actress, 57, revealed on Ellen on Thursday that before singing with Lady Gaga she realised she no longer knew the classic song by her character Phoebe Buffay and had to look it up.
Matthew Perry, who played Chandler Bing, joked that he doesn t hear from cast
He reunited with Courteney Cox, Jennifer Aniston, Matt LeBlanc, Lisa Kudrow and David Schwimmer on Friends: The Reunion which finally aired on Thursday
Lisa revealed the former co-stars still stay in touch and have a close bond after appearing on the sitcom together
Friends aired on NBC until 2004 and made stars out of its six main cast members
The singer, 35, appeared delighted to be performing a duet with Lisa Kudrow as she rocked out to the tune and gushed over the actress character during Friends: The Reunion special on Thursday.
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Friends fans were treated to a very star-studded trip down memory lane on Thursday after the sitcom s reunion special was finally released online and on apps ahead of airing in the UK and US tonight.
During the episode, supermodel Cindy Crawford slipped into those tight leather trousers which left Ross Geller (David Schwimmer) struggling in season five and Justin Bieber rocked the character s famous potato themed Halloween costume.
While David Beckham also made an appearance to reveal he s a clean freak like Monica Gellar (Courteney Cox) as he joined Reese Witherspoon, Cara Delevingne, Lady Gaga, BTS and Mindy Kaling to celebrate the show.