The Jonathan Ross Show viewers were left shocked during Saturday's episode as they noted Sheridan Smith kept 'grabbing' fellow guest Gary Barlow.
The pair - who appeared alongside Jeremy Clarkson, Riz Ahmed and Sting - left one Twitter user even having to check 'if the pair were now together' following the affectionate display.
The comments come after it was claimed Sheridan had a backstage meltdown and threatened to sack her team in a row about misogyny during her time on the chat show.
'She was all over him!' Viewers baffled as Sheridan Smith keeps 'grabbing' Gary Barlow on The Jonathan Ross Show - following claims she had a 'backstage meltdown'
Sheridan and Gary spoke about their new festive musical collaboration, How Christmas is Supposed to Be, before performing it on the show.
However viewers noted that the Gavin & Stacey star was being incredibly tactile.
One Twitter user said: 'What was going on with Sheridan Smith? She was all over Gary Barlow - I even googled to see if they were now together!' another wrote after the show ended.'
While another quipped: 'Bet Gary Barlow is wounded he's been stuck next to Sheridan Smith, shrieking and grabbing him every few minutes #jonathanross.'
Other viewers added: '@GaryBarlow @Sheridansmith1 keep your hands to to yourself! #jonathanross'; '@Sheridansmith1 loves the feel of @GaryBarlow's suit #jonathanross'.
Tactile: The pair - who appeared alongside Jeremy Clarkson , Riz Ahmed and Sting - left one Twitter user even having to check 'if the pair were now together' following the display
One Twitter user said: 'What was going on with Sheridan Smith? She was all over Gary Barlow - I even googled to see if they were now together!' another wrote after the show ended'
It was also reported that Sheridan had a backstage meltdown and threatened to sack her team in a row about misogyny after her appearance.
Despite seeming in good spirits on camera, Sheridan claimed the show had a 'chauvinistic' atmosphere, and felt she 'hadn't been treated kindly,' and lashed out at her team for organising the interview.
It's unclear what directly upset Sheridan, who was the only female guest on that episode, but a show spokesperson said she told host Jonathan it 'wasn't him.'
A source told The Sun: 'Sheridan was absolutely furious when filming on Jonathan Ross had ended.
New song: Sheridan and Gary spoke about their new festive musical collaboration, How Christmas is Supposed to Be, before performing it on the show
'She claimed the atmosphere was chauvinistic and there was an air of misogyny. She also claimed that she felt she had not been treated with kindness.
'Sheridan was seen shouting at the team who had come with her and said she was sacking them at one point. It was clear Sheridan was upset with her team backstage after filming.'
While a spokesperson for Jonathan Ross told the publication: 'Sheridan seemed to have a great time on the show but appeared to become upset afterwards.
'Jonathan asked her if she was okay and she said, ''Don't worry, it's not you.'' So Jonathan assumed it was a personal matter between Sheridan and the group of people she'd come with.
'We will investigate immediately. I hope Sheridan knows we would never take a claim of this kind lightly.'
Drama: Sheridan reportedly had a backstage meltdown and threatened to sack her team in a row
