Kylie Jenner and boyfriend Timothee Chalamet sit courtside with her sister Kendall as they watch his beloved Knicks after making red carpet debut

Kylie Jenner and her boyfriend Timothee Chalamet were spotted hanging with her sister Kendall as the group enjoyed a night out together on Monday.

The group sat courtside as the New York Knicks took on the Boston Celtics during game four of the Eastern Conference second round NBA playoffs.

The outing came days after Kylie, 27, and Timothee, 29, made their red carpet debut as a couple at a glitzy awards ceremony in Rome last week.

And amid claims that things between the couple are really H๏τting up, they were seen together again spending time with her sister, 29.

Kylie cut a Sєxy figure in a form-fitting black vest top which she styled with leather trousers and a pair of strappy heels.

Model Kendall opted for a similar look, also wearing leather trousers with a white vest top heels and a blue Knicks cap for the sporting occasion.

Kylie Jenner and her boyfriend Timothee Chalamet were spotted hanging with her sister Kendall as the group enjoyed a night out together on Monday

The group sat courtside as the New York Knicks took on the Boston Celtics during game four of the Eastern Conference second round NBA playoffs

And amid claims that things between the couple are really H๏τting up, they were seen together again spending time with her sister, 29

Timothee, who skipped the Met Gala last week to watch a Knicks game with his pals, watched eagerly from the sidelines as his team beat the Celtics 121-113.

He was clearly delighted with the victory as he was spotted jumping around in celebration with director Spike Lee.

At one point Kylie whispered something to Timothee while watching the game and they both flashed huge laughing smiles, looking totally smitten.

It comes as a source revealed that the lovebirds are ‘practically living together.’

A source close to the couple spoke about their recent debut and told Us Weekly: ‘Kylie’s really happy and relieved they finally made their debut.

‘It was time and she wanted to publicly support him and show how proud of him she is. She and Timothée have gotten really serious, and this was a big step.’

The insider also divulged, ‘They are practically living together at this point, as he stays at her house often when he is not working. He has been fully integrated into her life.’

And it was said that ‘everything is going really well’ between the A-listers.

The outing came days after Kylie, 27, and Timothee, 29, made their red carpet debut as a couple at a glitzy awards ceremony in Rome last week

Kylie and Kendall posed up a storm in the toilets at the stadium

Model Kendall opted for a similar look, also wearing leather trousers with a white vest top heels and a blue Knicks cap for the sporting occasion

Kylie cut a Sєxy figure in a form-fitting black vest top which she styled with leather trousers and a pair of strappy heels

Timothee, who skipped the Met Gala last week to watch a Knicks game with his pals, watched eagerly from the sidelines as his team beat the Celtics 121-113

He was clearly delighted with the victory as he was spotted jumping around in celebration with director Spike Lee

At one point Kylie whispered something to Timothee while watching the game and they both flashed huge laughing smiles, looking totally smitten

Timothee couldn’t hide his delight following his team’s big win

Read More Kendall Jenner shows ex-boyfriend what he’s missing during awkward reunion at NBA Playoffs game

‘She’s proud to stand by him and felt like it was the right time to share that part of their relationship,’ the source said about the duo’s first red carpet.

The person added: ‘They are in a really good place. He makes her feel calm and confident and it is a different relationship from what she has had in the past.’

On Monday night, the Complete Unknown star layered a short-sleeved brown Knicks shirt over a long-sleeved black one.

He added black pants and an edgy studded belt while he and his girlfriend put on an animated display at the sporting event.

As well as her sister, Kylie’s former BFF Jordyn Woods was in attendance as well.

Jordan, 27, had a falling out with Jenner in 2019 after a love triangle involved her, Kylie’s sister Khloe Kardashian, and Tristan Thompson. They were publicly seen to be rekindling their friendship in 2023.

There was also an awkward run-in for Kendall, as she laughed off another chance meeting with her ex-boyfriend Bad Bunny at the game.

Bad Bunny was spotted on his own at the group after the two briefly reunited at the Met Gala a week ago, where a source said they ‘said hello and hung out a bit.’

Kendall threw her head back and laughed at something one of her pal’s said

Spike Lee is also a huge Knicks fan and came out to support his team

The group cheered as the team made the next round of the tournament

As they all attended the Met Gala, Timothee watched a Knicks game from a tablet while his girlfriend stunned on the Met Gala red carpet.

She looked incredible as she arrived at the star-studded soiree in a custom Ferragamo gown. It boasted matching sheer opera gloves and a thigh-high slit that bared one of her long legs.

Chalamet’s night was spent watching the NBA playoffs, specifically ‘French NBA analysis,’ according to his Instagram Stories at the time.

He also appeared in a selfie with three friends, wearing a black hat and a gray hoodie over his head.

The reality TV star and Hollywood leading man reunited in Rome days later, walking the red carpet at the Di Donatello Awards.

They shared a sweet moment of PDA when the actor planted a kiss on the reality television personality before taking the stage to accept the David Speciale award.