Kayla Itsines, a fitness powerhouse on Instagram with more than nine million followers, announced to her fans that she is engaged to her longtime boyfriend and collaborator, Tobi Pearce.

Naturally, Kayla shared her happy news on Instagram.

'We have lived together for over four years, we have two 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 wrote. 'I obviously said YES to spending the rest of my life with my very best friend. We have been together for five and a half years now, and I cannot wait for the many years and memories to come. I love you so much @tobi_pearce.'

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She also posted a followup photo with Tobi after her fans sent an outpouring of support their way. 'Thank you to all our amazing family, friends, and community for the love today!' she wrote. 'We feel very lucky to have you all in our lives and cannot wait for the future.'

Kayla and Tobi co-created the Insta-famous BBG fitness guides, and a fitness app called Sweat. And though the couple generally shies away from sharing much of her personal life on Instagram, the Australian fitness pros make sure to post cute moments of them working—and working out—as a team.

And Tobi has taken time to gush over Kayla. 'Everyone knows the uncontrollable smile they get and they butterflies when you first start dating someone....it soon fades,' he wrote earlier in their relationship. 'Mine hasn't and never will because we are always changing and growing. So for me, everything, every week is fun and new when I am with you. Kayla J Itsines - I love you.'

Follow our exclusive ELLE UK 28-minute workout with Kayla below:

Congrats, Kayla and Tobi!

From: Women's Health US