Happy birthday to Adam Lambert! It’s hard to believe the former American Idol contestant, who appeared on the show back in 2009, turns 31 today, but we have no doubt the outrageous and outspoken singer will celebrate in style.

A true original, Lambert’s wacky, out-of-the-box look is as much a part of his appeal as his music. So in honor of his birthday, we’re celebrating his original style with a look back at his wackiest ensembles over the years.

From skinny pants in every fabric to loads of leather embellished with handcuffs and bondage-inspired accents, platform boots, black nail polish and heavy eyeliner, Lambert’s rocker-chic style can’t be boxed into a single category.

In fact, his head-turning style has led some to compare him to another performer known as much for her outrageous outfits as for her music – Lady Gaga.

When Lambert first hit it big as a contestant on American Idol, legendary fashion personality and Creative Ambassador-at-Large for Barney’s New York, Simon Doonan likened Lambert to the Gaga of men’s fashion in an interview with WWD.

“Just as now Lady Gaga is bringing back real glam rock for women, Adam is opening that door up for men,” Doonan told WWD in 2009.“You can wear the python boots and the shiny jacket.”

Though Lambert’s style has continued to evolve since he shot to fame as Idol‘s breakout star, the performer continues to march to the beat of his own sartorial drum in unique and out-of-the-box outfits.

Check out Adam Lambert’s 10 most outrageous looks from over the years.

Then join us in wishing the former Idol a happy birthday by sharing your picks for Lambert’s wackiest looks ever in the comments below.

To this day, Lambert remains one of American Idol’s most popular contestants. Find out who else ranks among the show’s most successful stars in the video below.