The Pretty Little Liars star posed for the cheeky photo with her five year old daughter Phoenix next to her as she holds one-year-old Lennon.
"Thank you Montana and @yourmontanagetaway for the MOST incredible stay!" she captioned the photo.
"You stole our hearts and by the looks of it, our clothes 😂🇺🇸 #youngwildandfree" she quipped.
Although most of her fans were quick to praise the 36-year-old's post, some users were still critical.
"It's cute but also kinda weird" one user said.
"This is a little strange for me" admitted another.
However, the majority of commenters loved the picture and commended Sursok on having her photo taken with no clothes on, saying it's promoting great body positivity for her girls.
"Love this! Both the photo and your courage of posting it online," one fan praised.
"Hell yeah for teaching your children to be body positive not body conscious!!"
"I love this!!!" another gushed. "I wish I had the courage to even do this let alone take a pic of it lol. Do you girl, screw the haters!!"
"Gorgeous Tammin!" added another. "Teaching your girls to be strong and confident! Oh my God I absolutely love this."
Sursok shares her daughters with actor and director husband Sean McEwan, whom she married in 2011.
The former Home and Away actress recently opened up about dealing with anxiety during the global pandemic, saying she's battled anxiety for for over 15 years, but felt 'completely calm' for the first time in her life with the recent lockdowns in LA.
"It hit me like a lightning bolt. This is the first time in my life, I really believe, I have no control," she said in an emotional Instagam post.
"And for the first time IN MY LIFE, I believe that what is happening, is that I'm practising acceptance."
The star has also opened up in the past to fans about her eating disorder, which she suffered from for eight years.