Popular Aussie fitness blogger Kayla Itsines engaged: 'Obviously I said yes!'

Popular Aussie fitness blogger Kayla Itsines has announced her engagement to boyfriend of four years, Tobi Pearce.

Itsines, 26, shared the news on her Instagram account @kayla_itsines.

"We have lived together for over four years, we have beautiful dogs, an amazing business....and to top it off...Tobi got down on one knee last week and asked me to marry him....in front of my family," she said.

"I obviously said YES to spending the rest of my life with my very best friend.

Itsines is an Australian personal trainer, author and entrepreneur.

She created a series of successful fitness eBooks called Bikini Body Guides that include meal plans and a popular workout app called Sweat with Kayla.

In March 2017 Itsines was named in Time magazine as one of the "30 most influential people on the Internet."

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The popular blogger has 20 million followers on Facebook and nine million followers on Instagram.

Her fiance Tobi Pearce, 26, is a personal trainer who built a fitness empire of his own after a troubled family life that left him homeless at 16.

The couple met at the gym when Pearce was studying a double-degree in law and commerce while also completing a course in personal training.

The have been together since 2013 and made their debut on the BRW Young Rich List in 2016 with a combined fortune of $46 million.