Aussie actress Rebel Wilson has already broken her New Year's resolution of not eating sugar.

"It's like a few days in, January 5th, and I've already broken it - I had Mars Bar pods," the Pitch Perfect star told 2DayFM's Sam & Rove.

"But I'm going to get back on the bandwagon for that because I'm trying to majorly cut down on sugar."

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Wilson also wants to be more sociable in 2016 however she's not off to a good start, spending much of her downtime in Sydney watching reruns of the Nine Network reality TV show The Block.

"I don't know why I'm obsessed with property renovations ... and watching them on TV," she said.

Rebel Wilson will star in new romantic comedy How to Be Single, released in New Zealand on Thursday, February 18.

- AAP