The 59-year-old actress jokingly said as much Monday on Australian morning show Today. Furness and the 46-year-old actor discussed their marriage and the challenges they've faced in the interview.
"[It's] part of the deal with this business," Furness said of kissing other people for work. "I've told his agent he's not allowed to work with Angelina. I'm sure she's very nice and I love what she's doing for shining a light on awareness for adoption."
"I'm just kidding," she qualified. "It just goes to show if you get it right and you pick the right partner, then you traverse all those travails and challenges."
Furness and Jackman met on the set of Australian series Correlli in 1995, and married the next year. The couple struggled to conceive and experienced two miscarriages before adopting son Oscar in 2000 and daughter Ava in 2004.
Furness is known for portraying Dolores Kennedy on Fire, and last appeared in the film Blessed. Jackman will next star in Peter Pan movie Pan, and is also scheduled for Marvel film X-Men: Apocalypse and a new Wolverine sequel.