Bombshell NFL Wife Rachel Bush Turns 21 with Lingerie and Cake

It's Rachel Bush's 21st birthday ... and if you've made it this far in the text, it's probably because you're wondering who this woman is besides being someone who's good at taking sexy photos.

So, allow us to enlighten you.

Bush is married to Buffalo Bills star safety Jordan Poyer and the two have a kid together. They've been together for about 3 years now and tied the knot back in February. Why are you still reading?

Rachel's super popular as a bikini model ... and has a huge fan base on Instagram with more than 700k followers. Once again, if you aren't scrolling through the gallery yet, that's some serious self-control.

Rachel rang in her 21st year on Thursday by posing with her birthday cake while sporting some lingerie. Seriously, what else do we need to say!?

She's also been in some pretty heated public beef with other attractive ladies -- but again, that's not really what you're here for right now.