Madison Beer's Sexiest Shots to Kick Off Her 26th Birthday!

Madison Beer has something to celebrate today ... it's her 26th birthday and, before we all pop a bottle of champagne, we just have to note she's looking hotter than ever.

Check out these photos of the Grammy-nominated singer-songwriter who not only knows how to belt out a tune -- but she also knows how to turn heads!

The titillating pics show Madison in various sexy poses ... shooting selfies, sporting lingerie, kicking back on the grass, and cooling off in a pool in her bikini.

Yes, we could go on and on ... but why do that when you can just look for yourself.

Fun facts: Madison rose to fame in 2012 after Justin Bieber posted her cover of "At Last" by Etta James on social media, resulting in an avalanche of publicity. Bieber then signed Madison to the same label with which he's associated, Island Records. And that's when her career really took off.