Gwen posted a snap from 1983, from when she was getting an autograph from Sting.
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The Police singer sits atop a motorbike, while an excited-looking Gwen looks very 1980s in a pair of shorts and mustard coloured top, white slingback shoes on her feet.
She captions the image: 'chunky me 1983. getting @officialsting autograph backstage. cut to...'
The 44-year-old followed this up with a photo from over a decade ago. The black and white picture shows her perched on the shoulders of fellow members of her rock group No Doubt; Tom Dumont, Tony Kanal and Adrian Young.
"12 years ago today?! No way?! thank u @LaChapelleland @RollingStone xo gx @nodoubt #fbf," she writes with the photo.
Gwen has recently revealed she's to welcome another boy with her musician husband Gavin Rossdale.
Posting a picture of herself to her Instagram account of herself wearing a crown, the star wrote: "I was ready to hand over the crown. but I guess I am still queen of the house. #itsaboy #surroundedbyboys"
The couple are already parents to sons Kingston, seven, and five-year-old Zuma.