Australian trainer and Instagram star Kayla Itsines [1] is officially engaged! The 25 year old, who's known for her BBG (Bikini Body Guide) [2] and Sweat programs [3], has over 9.4 million Instagram followers and 20 million fans on Facebook.

The beautiful bride-to-be showed off her stunning diamond ring from her boyfriend, Toby Pearce, who also helped create the famous fitness programs. Kayla's beautiful engagement ring features a stunning square-shaped rock [4] surrounded by a halo of diamonds.

Kayla showed off her diamond band on Instagram [5] with the the sweet caption, "We have lived together for over 4 years, we have 2 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! I obviously said YES to spending the rest of my life with my very best friend. We have been together for 5 and a half years now, and I cannot wait for the many years and memories to come . . . I love you so much @tobi_pearce."

Read on to get a closer look at her gorgeous engagement ring [6] and shop similar styles if you're feeling particularly inspired.