The account was founded just three days ago, on August 12, and has already amassed more than 9,500 followers.
The mums behind the page have chosen to remain anonymous, but have said they were inspired to celebrate the lines on women's bodies following a discussion about how their bodies had changed after having children.
Within 24 hours of posting the first photos and putting out a call for women and men of 'all shapes, sizes and cultural backgrounds' to submit their own pictures, the two mums had received over 70 submissions - including the picture above which is captioned:
"She loves my belly. Constantly massaging and rubbing it. Always squeezing and pinching the extra skin."When I first saw the stretch marks forming on my belly in the last few weeks of pregnancy, I was sad. I was even more devastated when I saw what my stomach looked like after I gave birth.
No longer flat, no longer firm, no longer stretch mark free, no longer the same. But then I thought about it, I am no longer the same! I am forever changed now that I am a mother! And these marks on my stomach are like a badge of honour!
"I found it interesting that all types of women have stretchmarks because I've had them on my thighs since I was a teenager," one of the founders, a 31-year-old wedding and lifestyle photographer, told The Huffington Post over email.
"So even though I'm a mum (which gave me a few more) I've been coming to terms with my marks for a long time now. I'm also very thin so looking at me with clothes on, you'd think I had no body issues."
The second founder, a 25-year-old entrepreneur added:
"Even though we are mums, we both had 'stretchies' before having kids and we are aware that women get them for different reasons at different times."
If you would like to submit your own photos to the Love Your Lines project email firstname.lastname@example.org. Photos submitted should be taken against a plain background.
More on Parentdish