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Heidi Klum, Instagram

Instagram

Bring in the glam squads, room service and plenty of diamonds. It's Oscars Sunday and the stars are stepping out in style!

In the hours leading up to the biggest awards show of the year, your favorite Hollywood celebs were more than willing to share how they were prepping for one of the most important red carpets.

Heidi Klum was ready to give credit where credit is due to her talented team. Oh, and she wasn't afraid to throw in some bling too.

"Getting ready for the Oscars thanks to my amazing team @marchesafashion @missnewbark @tombachik @lorraineschwartz @lindahaymakeup @wendyiles_hair," she shared on Instagram. "Shine bright like a diamond @lorraineschwartz."

Reese Witherspoon, Instagram

Instagram

Reese Witherspoon decided to break down her routine in three easy steps. Add burgers, flowers and makeup and you get "Oscars #Prep." Sounds like a pro, right? 

As for Lady Gaga, she's giving us a preview of her outfit and delivering a shout out to a special nominee.

"Don't know about u but I'm rooting for LEO!" she shared on Twitter. "He's blessed us w/ years of his storytelling, he deserves this! #1!!"

The fun on social media is just beginning. Take a look at the dozens upon dozens of stars getting ready for Oscar Sunday in our new gallery below.