For those of us who were practically raised on No Doubt-era Gwen Stefani (and her rock-hard abs and baggy carpenter pants), it's a very big day. After the ska-pop band's much-lauded reunion, their first album in 11 years (a follow-up to 2001's Rock Steady) is out! Push and Shove is officially available for download on iTunes, and the group also released the video for the record's second single of the same name! To celebrate such a momentous musical moment, we're taking a look back at early Gwen and the megastar now, as she approaches 43. Check out how Stefani has changed (and, in some cases, stayed the same) in the gallery below!