The 49-year-old actor, who also shares seven-year-old daughter Molly with wife Angela Malloch, looked dressed to the nines alongside his two children.
Jemma recently celebrated her 18th birthday, with Jason revealing on Instagram that he's a 'very proud Dad'.
While younger brother Zac is an aspiring photographer, with his famous dad labelling him as his 'best friend forever' on Instagram.
The former Neighbours star and wife Angela have been together since 1998, with the couple tying the knot in 2008.