The 31-year-old model attended a music festival in Mexico over the weekend where shared the exciting news with fans.
Waterhouse and her 37-year-old boyfriend have been in a relationship for more than five years and live together in London, however, they have always kept their romance pretty much under wraps.
Making the announcement, she said: “I’m extra sparkly today because I thought it might distract you from something else going on.”
She then opened the flap of her coat to reveal a growing baby bump, as the crowd at the festival cheered her on, as seen in a fan video shared on X/Twitter:
"I thought I’d wear something sparkly to distract you from something else I’ve got going on... i’m not sure it’s working”
Suki Waterhouse announcing that she’s pregnant today at Corona Festival! 🤰🏼💕pic.twitter.com/MhZEkCJVgb
— suki waterhouse archive (@bestsukiw) November 19, 2023
In an interview with The Sunday Times earlier this year, Waterhouse spoke about her relationship with the actor, saying she was “shocked that I’m so happy with someone for nearly five years”.
She said: “I’m always incredibly excited when I see his name pop up [on my phone] or even a text, and I think he feels the same about me.
“We’ve always got so much to say, and I find him hilarious."
But what do we know about the pair's relationship? Here is a rundown of everything we know about the happy couple:
The couple were first linked together in the summer of 2018 after entertainment news website E! shared pictures of them kissing on the streets of London after a movie date.
A source later confirmed to PEOPLE that the two were indeed an item and very happy together.
Waterhouse and Pattinson celebrated her 27th birthday at Casa Cruz in London. The pair were again spotted holding hands during a stroll in London after going on a run together, seemingly confirming their relationship despite the fact neither of them had publicly commented.
It was only later in the year during an interview with The Sunday Times, when Pattinson briefly spoke about his blossoming new romance, despite responding, "Do I have to?" when asked to talk about her.
He said: "If you let people in, it devalues what love is. If a stranger on the street asked you about your relationship, you'd think it extremely rude. If you put up a wall it ends better."
He added: "I can't understand how someone can walk down the street holding hands, and it's the same as when I do it and a hundred people are taking your photo. The line between when you're performing and when you're not will eventually get washed away and you'll go completely mad."
Later that year, for his 33rd birthday in May, the pair were spotted having dinner in Los Angeles.
At the beginning of 2019, the couple sparked wedding rumours when the model was spotted wearing a ring on her wedding finger during a Dior dinner party in Paris with the actor. However, the couple never confirmed anything themselves.
The Covid-19 pandemic then hit and the pair quarantined together in London, as reported by GQ.
It was later reported Pattinson had tested positive for Covid.
Waterhouse went Instagram official with Pattinson when she posted a picture of herself in her apartment in April 2021. In the background of the snap, you could see a framed picture of the loved-up couple kissing.
During an appearance on Jimmy Kimmel Live, Pattinson talked about how he watched The Batman for the first time with Waterhouse by his side, and melted the hearts of audiences around the world.
He said: "I'm pretty sure she's not normally into watching superhero movies, and just seeing that it was capturing her attention the entire time, and then she held my hand and touched it [to her face] and I could feel a little tear. And I was like, 'No way!' "
In an interview with The Sunday Times, Waterhouse opened up about her long-term relationship with Pattinson.
She said: "I'm shocked that I'm so happy with someone for nearly five years. I had two days off the other day, and it was like, no question I'm going back to see him."
Waterhouse also shared that she still gets "incredibly excited" when Pattinson's name pops up on her phone.
In May, they appeared at the Met Gala together and now, in November, Waterhouse has broken the news about their first baby together.