Lily Collins took a splash in a swimming pool with all her clothes on while joined by her Emily In Paris costar — and BFF — Ashley Park in a fun Instagram video shared on Saturday.

The 35-year-old Mirror Mirror actress — who recently put on a chic display while attending the season four premiere of the hit Netflix series — could be seen at what appeared to be a dinner party when she decided to cool down amid the summer heat.

The clip kicked off with the beauty strutting toward the camera while wearing a sleeveless black dress as someone else filmed.

She held a big smile on her face and suddenly began to run to jump into the rectangular-shaped pool shortly after the sun had set.

Guests yelled out as water splashed into the air, while others let out cheers and applause.

Seconds later, Ashley — who was fully clothed in a light brown ensemble — also followed suit.

She tossed her arms up in the air as she leapt into the water and let out an excited shriek as she swam up to Collins.

The two stars briefly swam around in the lit up pool, with Collins adding, ‘I couldn’t not do it!’

A man behind the camera then asked Lily and Ashley, ‘Is it cold?’

The To The Bone actress replied, ‘It’s actually pretty warm.’

Park — who is also known for starring on Broadway — admitted, ‘This is lovely,’ before showing off a little excited dance.

Toward the end of the lighthearted clip, both Lily and Ashley embraced while also sharing a big laugh. ‘It’s really lovely,’ the Joy Ride actress added once again.

The camera then panned away from the pair to show the other guests sitting at a long table decked out with candles and ornate floral arrangements.

They could be seen looking at the stars as they had a blast in the swimming pool, with one also filming the funny moment.

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The clip kicked off with the beauty strutting towards the camera while wearing a sleeveless black dress as someone else filmed

In the caption of the video, Lily penned, ‘Emily’s entering a new era and apparently so am I. Who is she??…’

Social media users jumped to the comment section to share their thoughts on the spontaneous late-night swim and Collins’ close bond with Park.

One fan typed, ‘I love how her BFF also jumps in! That is the definition of friendship for life!’

Another added, ‘I love that Ashley is the “I jump, you jump” friend,’ while one shared, ‘Aw I love this so much lol and you can feel the love between you and Ashley, Lily!’

‘Ashley with the “wait, it’s really lovely!!” you two are so cute,’ a fan wrote, while one Instagram user penned, ‘THE SHORT HAIR BRINGS OUT HER WILD SIDE!!! ❤️❤️❤️❤️.’

In the hit Netflix series, Emily In Paris – which was created by Darren Star – Lily portrays the role of Emily Cooper who moved to Paris to work as a social media strategist.

Ashley plays the character of an aspiring singer, Mindy Chen, who became friends with Emily.

The first part of the fourth season — which has been slammed by critics as ‘deeply annoying’ — premiered on Thursday, with the second part set to air on September 12.

Over the years, both Collins and Park have also developed a close friendship off-screen – which they have previously opened up about.

Towards the end of the lighthearted clip, both Lily and Ashley embraced while also sharing a big laugh. ‘It’s really lovely,’ the Joy Ride actress added once again

The camera then panned away from the pair to show the other guests sitting at a long table decked out with candles and ornate floral arrangements

In the caption of the video, Lily penned, ‘Emily’s entering a new era and apparently so am I. Who is she??…’

During an interview with Harper’s Bazaar Arabia last year in February, Lily said of Ashley: ‘What’s so incredible is that she met me as the woman that I was at 30.’

‘She only views me as I am now. And for her, that’s enough. Sometimes I feel that you carry a lot of the past with you, and that defines who you are now, and that weighs on you a little bit.’

The star added, ‘But with Ashley, she only knows me as I am now, and makes me feel like me now is enough. It’s an amazing feeling to have found a sister at this point in my life.’

Park also gushed about her castmate, and said, ‘It’s been amazing to watch Lily really take on this leadership role as a producer. She is a caretaker, the most gracious leader.’

‘To watch her growth, to watch her be able to believe in herself in a way she didn’t know she was capable of has been – Oh gosh, now I’m going to cry. Right at the end of the day, I’m going to cry!’ she emotionally added.

And while talking to the National Post during a joint interview earlier this month, Lily recalled first meeting Ashley. ‘Like literally, I turned around and saw you and we just connected.’

‘It was obviously a surface connection in terms of what it is now, but it went so deep without even knowing it was immediate.’

‘It was such a feeling. And I think that was a real magical, crazy moment to think about because there are photos of that,’ the beauty said.

And while talking to the National Post during a joint interview earlier this month, Lily recalled first meeting Ashley. ‘Like literally, I turned around and saw you and we just connected’

She was joined by other stars at the season four premiere on Wednesday (seen above) such as Ashley, and the pair paused for a few photos together

Emily In Paris also stars Philippine Leroy-Beaulieu, Lucas Bravo, Camille Razat, Samuel Arnold, Lucien Laviscount and also Bruno Gouery.

The new season also takes place in the city of Rome, offering a change for the characters and plot of the series.

Earlier this week on Wednesday, Collings glammed up in a strapless, black gown with a peplum accent around the waist for a unique flare at the season four premiere in Los Angeles.

She was joined by other stars at the special event, such as Ashley, and the pair paused for a few photos together.