WATCH: Jimmy Fallon and Will.i.am’s hilarious charity single ‘EW’

BEST.THING.EVER.

Jimmy Fallon and Will.i.am embraced their inner 13-year-olds for The Tonight Show’s debut charity single ‘EW'.

The duo hilariously don wigs, dresses and braces to play BFF's Sara and Mir.i.am and discuss the ever important topics that matter most to young girls, duck lips, selfies, face-time and "impleggies" (butt implants.)

And we just LOVE it!

With lyrics like,

“Look at look at this. OM-effin-G, what the eff?

You're gonna freakin' flip, like, seriously freakin' flip.

Cuz Sally's mad at Iggy because Iggy's booty's more biggy,

And Sally's booty's twiggy so she called her friend Cybie,

Now Sally's gonna get impleggies --”

who wouldn’t?

The song stems from the show’s recurring sketch 'EW' in which Fallon has recruited celebrities guest such as Lindsay Lohan, Taylor Swift, Zac Efon and even Michelle Obama.

'Ew!' is available to download from iTunes and all proceeds from the sale of the song will go to the SeriousFun Children’s Network and i.am.angel Foundation.