AUSTRALIA'S biggest family is getting bigger again, and Toowoomba supermum Jeni Bonnel says she's "darn excited" to broaden her brood.

This week Mrs Bonell confirmed heir eldest daughter, Brooke, was pregnant with a second child.

For the mother of 16 and grandmother of two, the new child novelty hasn't worn off.

"Even when we were having our own children it was that same excitement every time we added to our brood," Mrs Bonell said.

"And grandchildren are a whole other level, because you get to enjoy the babies but you don't have to do the sleepless nights."

The Toowoomba family hosted a gender reveal celebration on Christmas Day.

"These gender reveal parties are very new to me, and very exciting."

"We always waited for the surprise when the baby arrives."

Blue confetti rained down on the green and red decorations, revealing the 19th Bonell child would be a boy.

It was a welcome surprise, bringing more joy to already special day.

"Any time the family gets together there's always some sort of excitement. You never know what's going to happen.

"When you throw in a gender reveal and confetti and balloons and cannons, how could you not have a good time."

"that was the best gift that anyone got on that day."

Previously, the family revealed their weekly grocery bill exceeds $600.

That includes 17 three-litre bottles of milk and 14 boxes of cereal.

WATCH: The Bonell family's gender reveal