Kim Kardashian, Kate Beckinsale, Zoe Saldana, Rita Ora, Olivia Wilde (alongside Chris Rock!) join newly-engaged Channing Tatum and Zoe Kravitz in bringing serious star power to Leonardo DiCaprio's Titanic 49th birthday bash in Beverly Hills

Leonardo DiCaprio threw a 49th birthday party of Titanic proportions on Saturday night, drawing an A-list crowd from corners of Hollywood — from movies, music and even reality television.

Kim Kardashian was among the celebrities attending the Titanic star's birthday bash in Beverly Hills on Saturday evening. The 43-year-old icon was spotted departing the bash wearing a sleeveless black outfit and with her face flawlessly done-up.

Leonardo managed to avoid being photographed but was joined inside by his new girlfriend Vittoria Ceretti, 25, and the pair packed on the PDA and were 'affectionate and kissing throughout the night,' according to an insider.

Among other A-list celebrities at the party were House of Gucci stars Lady Gaga, 37, and Salma Hayek, 57. Meanwhile Chris Rock, 58, was pictured departing the bash in the same car as actress Olivia Wilde, 39, who split from Harry Styles, 29, last last year.

Others present at the soiree included Kate Beckinsale, Rita Ora, Zoe Saldana, and Snoop Dogg. Saldana, 45, was joined by husband Marco Perego as they headed to the gathering following their appearance at the Baby2Baby gala.

Wilde and fellow singleton Chris were seen laughing it up in the car as they left the party together.

Olivia sported a crew neck white T-shirt and rocked thin, winged black liquid eyeliner. And Rock, 58, was casually dressed in black pants, a gray crew neck shirt and a black jacket.

He flashed his megawatt grin as the unlikely pair seemed to be enjoying each other's company.

It comes nearly one year after Olivia's almost two-year relationship with British singer Harry Styles came to an end.

The former One Direction star is now romancing actress Taylor Russell, with whom he recently attended a U2 concert.

Prior to her coupling with Styles, she was in a long-term relationship with actor Jason Sudeikis.

The two are co-parents to son Otis, nine, and daughter Daisy, seven. Their pairing came to an abrupt end when she sparked a flame with Harry while shooting her film Don't Worry Darling.

As for Chris, he was linked to fellow comic Lake Bell throughout 2022 — and she ironically hung out with Sudeikis at a Guns 'N' Roses concert earlier this month.

A source also confirmed to DailyMail.com that Jason and Lake are not a romantic couple, but 'just friends.'

Snoop Dogg, 52, was seen arriving to the bash in a black SUV as he stuck his head out of the backseat window.  

Zoe and her husband coordinated in a black and white color palette. The Colombiana actress flashed her cleavage in a low-cut white dress with a black rose print throughout.

The thigh-grazing frock featured an attached sarong-like wrap with a side tie.

The acclaimed performer showed off her long legs in the fashionable ensemble, finishing with a pair of black Mary Jane-style high heels.

The mother-of-three's lustrous dark hair was cut into a bob with the front pieces tucked behind her ears.

Meanwhile, her longtime spouse looked spiffy in a black suit worn with a black shirt and shoes. 

Kate Beckinsale cut a very glitzy display in a bejeweled bodysuit as she arrived.

The actress, 50, was joined by stylish Rita Ora, 32, who donned a glamorous black mini dress, paired with a sophisticated overcoat.

Kate turned heads in her statement-making ensemble as she arrived with a helping hand from a friend after opting to wear towering platform heels.

She flashed her tiny torso in the corset bodysuit, which featured a huge blue diamanté detail, with silver gems on the bustier.

Other famous faces who made their way to the celebration included newly engaged Zoe Kravitz and Channing Tatum. They were seen arriving in the backseat of a luxury black car.

The High Fidelity actress' raven-toned locks were styled in micro braids and she wore a black coat.

Her husband-to-be sat next to her, wearing a short-sleeved black shirt. 

Rita Ora and husband Taika Waititi also opted for black getups as they headed to the swanky bash.

The singer-songwriter showed off her sense of style in a clinging, short, satin dress. The low-cut number flaunted her perky chest and she topped the look with a long, coordinating coat.

Rita put on a leggy display in the look, slipping her stems into a pair of sheer black pantyhose.

She carried a black handbag and wore pointy-toe high heels while clutching her husband's arm.

Her long, golden blonde hair was styled in a deep center part and voluminous tight waves. 

For his part, Taika wore a button-up shirt with a side pocket over a white tank top. 

Rapper 2 Chainz looked impeccable in a loose-fitting, casual black velvet suit teamed with black footwear.

His locked hair was styled in long, thick braids and he shielded his eyes with a pair of rectangular black sunglasses.

The music artist arrived solo with a joint in his hand and a flashy, chromed out Cuban link chain wrapped around his neck. 

Kris Jenner's longtime beau Corey Gamble made an appearance at the shindig as well.

The tour manager and entrepreneur wore a black silk outfit and was seen with a cigar in his mouth.

He added a pair of black sneakers with a white sole and carried a black alligator skin backpack. 

Casey Affleck and Caylee Cowan made their appearance at the function a date night.

Affleck, Ben Affleck's younger brother, was dressed in light wash blue jeans and a crew neck blue sweater.

He added a blue and white trucker hat as well as a pair of tan-colored hiking boots. Caylee wowed in a fitted, blue turtleneck and a black mini skirt.

Emile Hirsch was also there, dressed in belted black jeans, a button-up shirt, and a black leather jacket.