IF YOU'RE going to be upstaged on your wedding day, best it be done by a handful of firefighters and a pop star.

At least that's the view of Bendigo newlyweds Kara and Warwick Simmonds whose nuptials were accidentally gatecrashed by three Country Fire Authority crews and Australian pop icon Marcia Hines on Sunday.

The loved-up couple were celebrating their marriage at Bendigo's Old Fire Station when a smoke machine set off an alarm and forced an evacuation.

As the wedding party took the opportunity to take some silly snaps with the firefighters outside, a famous head popped into view.

"Suddenly someone yelled out "Marcia Hines" and we realised she had photo-bombed one of our photos," Ms Simmonds, nee Denmeade, said.

"I made a beeline for her and she was more than happy to get photos with us, she was brilliant, she was so accommodating.

"When our smoke alarm went off she was evacuated too. We interrupted her rehearsal but it ended up being a gift for me."

Hines was in Bendigo to perform her latest tour Amazing at The Capital theatre.

"It was just hilarious, all night that's the thing everyone was talking about," Ms Simmonds said.

"I actually said to my husband, we can pack up and go now, we're not going to be able to top that. They were asking if we'd organised it, but I can tell you right now, we can’t plan that well, we could not have planned the whole thing better.

"We’re very cruisy people at the best of times, we wanted a fun and relaxed wedding and we definitely got that, it was certainly fun and memorable."