But it was when Lady Gaga sang a duet with Joseph Gordon-Levitt that things really heated up.
The 27-year-old pop star slipped into a slinky red gown as she and the actor sang a version of 'Baby It's Cold Outside' during the 90-minute special on Thanksgiving.
Getting cosy: Lady Gaga and Joseph Gordon-Levitt sang a duet together on The Muppets' Holiday Spectacular on Thursday
He looked suave in a black suit and tie as he held her close and crooned in her ear at various points throughout the classic song.
The pair ended the number with Joseph elegantly dipping Gaga to the floor.
Lady in red: The Poker Face singer showed off
her svelte figure in the fitted dress as and Joseph danced around a
chaise lounge on a smokey stage
Chemistry: He looked suave in a black suit and
tie as he held her close and crooned in her ear at various points
throughout the classic song
Marilyn-esque: Gaga sported a platinum blonde 'do as she sashayed her way around the stage
During one song, she is surrounded by Kermit, Miss Piggy, Walter, Fozzie Bear, Dr. Bunsen Honeydew, two chickens, Green Frackle, and Dr. Teeth & The Electric Mayhem.
The energetic, bouncy bunch all sing along to Gaga's song Applause, and Kermit is even seen excitedly clapping to the beat.
Gaga - born Stefani Germanotta - was clad in a plunging silver sequin top and wavy blonde wig with fringe alongside four tuxedoed dancers.
Racy: Gaga wore a plunging sequined gown during one number
Famous friend: Kermit The Frog and his fellow Muppets joined in the fun
In one scene, Kristen gushed that she loved Gaga and asked her for her autograph, as Miss Piggy looked on with jealousy.
Gaga and Elton John performed a version of his hit Benny And The Jetts.
'You're my favourite girl you know that, how've you been my angel?' said Elton.
'You help me to stay inspired,' she said, as they both tinkered on their pianos.
Another famous face: Kristen Bell made an appearance, and danced with Bobo The Bear during one segment
Legend: Gaga and Elton John performed a version of his hit song 'Benny And The Jetts' together
As charming as ever: Kermit was seen happily dancing to the music with his buddies
But Miss Piggy would have none of it, and confronted her longtime love over his alleged flirting with the singer.
'Is that lipstick on your cheek?' shrieked Piggy.
'I was just connecting with her,' he replied, before Piggy gave him a slap.
Having a ball: Gaga sported a voluminous hairstyle as she sang a duet with Kermit at the piano
Not a happy bunny: But Miss Piggy would have
none of it, and confronted her longtime love over his alleged flirting
with the singer
'We won't even mind if she mistakes some of the Muppets for pieces of her wardrobe - again.'
Kermit was, of course, referencing the time Mother Monster donned a coat created from numerous Kermie mini-me's on German television back in 2009.
Typically flamboyant: Gaga wore a hot-pink ensemble during another scene, as The Muppets eagerly hung on her every word
Lady Gaga will also appear in the upcoming eighth Muppet feature - Muppets Most Wanted.
The mistaken identity jewel heist caper - due out March 21 - also features cameos from Tina Fey, Christoph Waltz, Celine Dion, and Usher.
The Born This Way hitmaker also worked with puppeteers inside a unicorn for her dramatic entrance at the American Music Awards Sunday, but all her pageantry hasn't translated to record sales.
