The 35-year-old shoe designer took to Instagram to share a hilarious Animoji video of the former Today host singing 'If You Don't Know Me By Now' by Simply Red.
Father-of-three Karl, 45, even added his own special lyrics to the song, telling Jas he's "loved her since they day they met".
Jas was clearly proud of her husband's singing skills, and captioned cute video: "My morning wake up call 🥰😍."
Some fans said they thought the video was "brilliant", however others branded Karl's singing head as "terrifying".
Actress Jessica McNamee was impressed, writing: "💕 Dream boat"
Another Instagram user wrote: "The real Masked Singer", referencing Monday's finale of the popular singing show.
Karl even joined in on the fun, writing: "That's not me."
Before marrying Jasmine, Karl was married to Cassandra Thorburn for 21 years, before they split in 2016.
Together they share thee children, son Jackson, 20, daughter Ava, 12, and son River, 12.
Cass recently spoke out about how co-parenting with Karl is "very difficult" and a "massive challenge."
Speaking on The Juggling Act podcast, the 48-year-old said “Co-parenting I think is a massive challenge. Even if there's an amicable agreement between the parties, it still becomes hard.”
“You're leading separate lives, you're no longer in a co-environment. So co-parenting... that's a big word,” Cassandra said.