We all have an old pair of jeans that we hope to fit back into one day.

And for this Youtuber, it was her pre-pregnancy jeans that she wanted to squeeze back into. Anna Saccone shared pictures on her Instagram page recently to show that four months after giving birth, she was able to fit back into her pre-pregnancy denims.

A post shared by Anna Saccone (@annasaccone) on Aug 7, 2017 at 9:50am PDT

And her secret? A simple hair tie. The blogger posted two photos, one showing off her outfit, and the other showing how a hair tie was all she needed to be able to squeeze back into her grey skinnies. She explained that whether you just had a baby, or simply ate too much Domino's last night, this cheap trick is all you need. She said: "4 months postpartum and I'm finally fitting into my pre-pregnancy jeans...NOT!!

A post shared by Anna Saccone (@annasaccone) on Oct 20, 2017 at 1:38pm PDT

"But seriously this hair tie trick is the biz if you're either side of a pregnancy, have eaten too many brownies or just feeling bloated. "Also just wanted to give an example of how what you see on Instagram isn't always necessarily 'real' - I mean god knows what other tricks I might have hiding under my floaty tops." All Anna did was loop her hair tie around the top button and into the button hole and violá! She was back in her fave denims. We might be using this the next time we feel a bit of a bloat coming on.