Bill Murray called out for unexpectedly kissing married co-star during live Q&A

Bill Murray has been called out for unexpectedly kissing his married co-star during a live Q&A on a chat show.

The Ghostbusters actor, 74, appeared on Watch What Happens Live alongside Naomi Watts on Monday evening (31 March) when things took a swift turn.

During the Q&A segment of the Bravo show, one fan asked Watts 'what has been the best on-screen kiss of your career'.

Before she could answer, Murray grabbed her face and kissed her on the mouth.

It seemed that the kiss hadn't been rehearsed as viewers thought Watts looked slightly surprised by the exchange.

Some have since called it 'disgusting and shameful', while others said Murray 'hasn't moved on' with the world.

You can take a look at what happened below:

After the kiss, Watts chuckled, telling her castmate: "You’ve got lipstick on your face," before asking if she had gone 'red' over the incident.

"That was too easy," Murray replied, adding: "That was way too easy."

As reported by Decider, she then responded to the initial question with: "Well, of course, it’s Billy Crudup, my husband."

Notably, before or after the incident, Watts was seen kissing Murray on the cheek.

Bill Murray kissed Naomi Watts on the mouth during an appearance on Watch What Happens Live (Bravo)

Over on social media, however, viewers were stunned by what they saw.

"I feel so bad for her that she had to pretend to be okay afterwards," one person thought.

"He just humiliated her on live TV," a second penned.

While a third added: "The look he gives the camera like...yep and wtf are you gonna do about it?"

Another person also wrote: "Jesus, the death grip on her face. Poor Naomi."

As someone else said: "When the 80’s meets the noughties. It was never right to do something like that back in the day, but it was accepted far more than it is now, and rightly so.

Watts also kissed Murray on the cheek during the programme (Bravo)

"The world’s moved on but Bill hasn’t. I’m positive he meant nothing by it and was simply being himself in the 80’s.

"Terribly misjudged Bill. Expect a backlash!"

The pair have appeared together in new drama The Friend, which is directed by Scott McGehee and David Siegel.

It follows Iris (Watts), a New York writer who inherits a 150-pound Great Dane named Apollo after the sudden death of her friend and mentor, Walter (Murray).

As Iris copes with her grief and adjusts to life with Apollo, she navigates complex relationships with Walter's three ex-wives, played by Carla Gugino, Constance Wu, and Noma Dumezweni.

LADbible Group has contacted Bill Murray and Naomi Watts' representatives for comment.