2016 Oscars: See the Stars at All the Parties!

Fierce, ladies! Carey was all smiles as she hung out with Osbourne (and flashed her insanely large 35-carat engagement ring!) during the 24th Annual Elton John AIDS Foundation's Oscar Viewing Party at The City of West Hollywood Park on Feb. 28.

The singers were cheek to cheek as they arrived for Elton John's Oscar Viewing Party in West Hollywood.

The actress beamed in West Hollywood as she attended Elton John's Oscar Viewing Party.

The model hugged the former Olympian at Elton John's Oscar Viewing Party in West Hollywood.

The pair took the carpet by storm at Elton John's Oscar Viewing Party in West Hollywood.

The fabulous trio was all smiles at Elton John's Oscar Viewing Party in West Hollywood.

The husband-and-wife duo were quite the fashionable pair at the Vanity Fair Oscar Party in Beverly Hills, California, on Feb. 28. Biel shimmered in an embellished Zuhair Murad dress with a sheer top and solid skirt, while Timberlake looked dapper in a sleek suit.

See even more pics from the A-list soiree here.

The Black-ish star and the 2005 Oscar winner posed at the Mercedes-Benz and African American Film Critics Association Oscar-viewing party at Four Seasons Hotel Beverly Hills.

Supermodel Chrissy Teigen definitely had that pregnancy glow as she posed in a gorgeous red gown alongside her husband, John Legend, at The Weinstein Company's Pre-Oscar Dinner -- presented in partnership with FIJI Water, Chopard, DeLeon and Lexus -- on Feb. 27 in Beverly Hills, California.

The 45-year-old supermodel appeared to be enjoying herself at The Weinstein Company's Pre-Oscar Dinner -- presented in partnership with FIJI Water, Chopard, DeLeon and Lexus -- on Feb. 27 in Beverly Hills, California.

The gorgeous actresses posed for a photo inside the Vanity Fair and Stuart Weitzman Luncheon at A.O.C. in Los Angeles on Feb. 26. The daytime fête just so happened to be celebrating Banks. 

It was a black-and-white affair for these three beauties! The singer, model and actress (respectively) dressed to impress while stepping out to Vanity Fair and L'Oreal's "DJ Night" Party -- hosted by Hailee Steinfeld and Taryn Manning -- at the Palihouse in West Hollywood, California, on Feb. 26.

The Dancing With the Stars champion showed off her flawless figure (and tattoos!) in a strapless, body-hugging LBD at the "DJ Night" party on Feb. 26. Willis completed her chic look with black-as-night acrylic nails, a studded clutch and pointy-toe heels.

Despite her DJ and hosting gig, Steinfeld still found time to hang out with her pal at the Palihouse in West Hollywood, California, on Feb. 26.

The Sports Illustrated Swimsuit Issue cover model turned heads (including her own!) as she made her way into the William Morris Endeavor pre-Oscar party in Los Angeles on Feb. 26.

What's a party without a little sparkle? Bell rocked a very daring mesh top, which she paired with tailored black skinnies and pointy-toed heels, to the Ninth Annual Women in Film Pre-Oscar Cocktail party at Hyde Sunset Kitchen + Cocktails in West Hollywood, California, on Feb. 26. Silverstone showed a bit less skin at the soiree, which was presented by Max Mara, BMW, MAC Cosmetics and Perrier-Jouet, opting for a glittery spaghetti tank dress.

The Path star also chose a sheer look for the pre-Oscar cocktail party, opting for a low-cut floral dress that featured a lace-trimmed overlay.

The 25-year-old actress, who has a best actress nod for her leading role in Joy, made a surprise appearance at the Women in Film event. After a bit of encouragement, she took to the stage to discuss equal pay for women.

Both actresses positively glowed at the Cadillac Oscar Week Celebration at Los Angeles' Chateau Marmont on Feb. 25. Walsh showed off her curves in a low-cut watercolor-print white frock, while Janney looked sharp in a navy blue blazer.

Brothers-in-law on-screen, pals off! The Modern Family co-stars matched in checkered button downs to the Cadillac Oscar Week Celebration. Ferguson paired his orange-and-blue shirt with a slate suit, while Burrell went extra dapper with a gray three-piece.

Check out those guns! The Destiny's Child alum struck a pose in a tuxedo-inspired black jumpsuit at the Cadillac celebration.

The British actress met up with her Star Wars: The Force Awakens director at the Oscar Wilde Awards in Santa Monica, California, on Feb. 25.

The sisters pouted like pros at the M.A.C. Cosmetics Zac Posen luncheon at the Ennis House in Los Angeles on Feb. 25.

The gorgeous, same-named gals shared a laugh on the red carpet at the 3rd Annual unite4:humanity event in Beverly Hills, California, on Feb. 25.

The Vinyl star embodied hippie-chic when she turned up to the unite4:humanity event at Montage Beverly Hills in a gorgeous long-sleeved white lace dress on Feb. 25.

The actresses hugged it out at Alfre Woodard's 7th Annual "Oscar's Sistahs Soiree presented by Tanqueray No. TEN" in Los Angeles on Feb. 24.

The We Are Your Friends star and former American Idol judge had rosy outlooks at Global Green USA's 13th Annual Pre-Oscar Party in Beverly Hills, California, on Feb. 24. Ratajowski looked lovely in a ruffle-sleeved dress, while Abdul opted for a floral blouse-and-fuchsia skirt combo.

Just a couple weeks after swapping stories on The Late Late Show With James Corden, the Ohio natives hung out at the Global Green USA party at Mr. C Beverly Hills on Feb. 24.

The Grease: Live! star looked fierce as she made her way into the Vanity Fair and FIAT Young Hollywood party at the Chateau Marmont in Los Angeles on Feb. 23.

The Glee co-stars showed a little skin at the Vanity Fair and FIAT Young Hollywood Celebration in Los Angeles on Feb. 23. Both opted for black outfits -- Tobin paired her mesh dress with wine-colored lips, while Michele bared her abs in a one-shouldered crop top.

Is Rodgers going to pull a Sean Avery and moonlight as a fashion designer? The Green Bay Packers quarterback looked oh-so-dapper in a blue checkered suit as he attended the Young Hollywood soiree with his actress girlfriend on Feb. 23.