Solomon, who is expecting her first child with Swash this year, told her Instagram followers that she was listening to a classical composition in the car because he had been told it was “good for the baby”.
Looking unimpressed, Solomon told her fans that she “didn’t think Swash could name one piece of music” from the genre despite his protestations that he could hum along to Beethoven.
As they continued driving, Solomon suddenly worked out where she had heard the track before and excitedly shared the news with Swash and her fans.
“Do you know where you know this from? I can tell you. This is from Mrs Doubtfire right at the beginning when he’s doing the cartoon,” the pregnant star explained.
Solomon then asked her followers whether they agreed that the piece of music - Largo al Factotum from The Barber of Sevill - was indeed used in the film’s opening.
Solomon had earlier shared a sweet snap of her son Leighton, six, helping her get ready for her “rare night out” at an event for Stand Up 2 Cancer and Cancer Research.
Solomon told fans she was tearing up at the cute moment after posting the image of her son zipping up her dress,
“He’s had my back and melted my heart from day one,” the 29-year-old wrote, adding: “Had a little cry after I took this for no reason whatsoever other than the overwhelming love I have for my babies.”
Solomon later shared pictures and videos from the red carpet with pals Denise Van Outen and Lydia Bright.
In one snap, the duo cradled Solomon’s growing baby bump while another showed them joined by Swash and actor Jake Wood.
Solomon and Swash, who have been together three years, announced the pregnancy last month. They are already parents to Solomon’s sons Zachary, 10, and Leighton, six. Swash has a son Harry, 11, from a previous relationship.