Fitness blogger Kayla Itsines has announced the birth of her first baby after sharing an adorable photo of her husband Tobi Pearce cradling their little girl.

The 27-year-old posted the picture-perfect shot to her Instagram this morning with the caption "Welcome to the world Arna Leia Pearce".

Kayla revealed their daughter arrived late last week via caesarean, and both mum and bub are recovering well.

Upon hearing her little girl cry for the first time, the creator of the Bikini Body Guide and co-founder of fitness app Sweat said she couldn't describe how she felt in that moment.

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"In that second, we heard her cry for the first time, the doctors and nurses examined her quickly, bought her over to us and said 'she is absolutely perfect'. My doctor said 'Look at that hair and those cheeks! Amazing!'

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🌸Welcome to the world - ⁣⁣ Arna Leia Pearce ⁣⁣ ⁣⁣ 💛 I just stared into Tobis eyes the whole time during delivery, nervously whispering “please let her be healthy, please be okay, please be okay” and Tobi kept repeating “I love you so much - she’s going to be healthy it’s okay just breathe it’s okay”. We both were crying.⁣⁣ ⁣⁣ In that second, we heard her cry for the first time, the doctors and nurses examined her quickly, bought her over to us and said “she is absolutely perfect”. My doctor said “Look at that hair and those cheeks! Amazing!”⁣⁣ ⁣⁣ I don’t even know how to describe how I felt in that moment. I looked over at Tobi who looked like the proudest Dad I’ve ever seen, with tears running down his face he gave me a kiss on the forehead and whispered “She’s so perfect, I love you”.⁣⁣ ⁣⁣ She is perfect indeed! From the start, she knew exactly who we were and was instantly calm. Tobi went into ‘Dad mode’ straight away. From someone who made jokes the whole 9 months about not being able to change a diaper ... to now not wanting to let ANYONE change her because he wants to help - has made me love him even MORE. Tobi wraps her up and cuddles her and she goes straight to sleep 💤 She’s a happy quiet bubba who LOVES her big greek family😍⁣⁣ ⁣⁣ As for me, I ended up having a cesarean, as recommended by the doctor. I was a little bit sore, but after a couple of days I was generally fine, just no lifting other than Arna. Now, I just need to rest, eat good food, drink lots of water and I’ll be okay!⁣⁣ ⁣⁣ I feel so BLESSED right now. I AM blessed to have Tobi and my family be there every day. I am so thankful to have the most amazing doctor and midwives ever to help me. This experience has been amazing for me and I am proud to say that💛🌸.⁣⁣ ⁣⁣Thank you everyone for being SO amazing!! We are so in love and happy. Holding her for the first time in our arms was truly the best day of our life💕

A post shared by KAYLA ITSINES (@kayla_itsines) on

"I looked over at Tobi who looked like the proudest Dad I've ever seen, with tears running down his face he gave me a kiss on the forehead and whispered 'She's so perfect, I love you'."

Kayla explained that doctors recommended she have a caesarean.

"I was a little bit sore, but after a couple of days I was generally fine, just no lifting other than Arna. Now, I just need to rest, eat good food, drink lots of water and I'll be okay," she said.

The Adelaide-based entrepreneur, who last year came fifth in the Financial Review's Young Rich List with an estimated net worth of $486 million (together with hubby Tobi), went on to say she felt extremely blessed.

"I am blessed to have Tobi and my family be there every day. I am so thankful to have the most amazing doctor and midwives ever to help me," Kayla said in her post.

"This experience has been amazing for me and I am proud to say that. Thank you everyone for being SO amazing!! We are so in love and happy. Holding her for the first time in our arms was truly the best day of our life."

Kayla posted the sweet message to her Instagram story. Photo / Instagram
Kayla posted the sweet message to her Instagram story. Photo / Instagram

As for Tobi, well, he has already gone into "dad mode".

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"From someone who made jokes the whole 9 months about not being able to change a diaper … to now not wanting to let ANYONE change her because he wants to help — has made me love him even MORE.

"Tobi wraps her up and cuddles her and she goes straight to sleep. She's a happy quiet bubba who LOVES her big Greek family."

During her pregnancy Kayla hit back at trolls who slammed her for working out while pregnant.

While many commended her on expanding her workouts to include pregnant women, others claimed it was reckless to lift weights while pregnant.

But Kayla was quick to clap back, explaining she got the all-clear from her doctor.

"As long as you have clearance from your doctor, you CAN work out and you can use weights. Just because I'm standing in a gym with a crop top and shorts doesn't make it any less safe to lift something," she said earlier this year.