The 23-year-old star, who has been dubbed the British version of Kim Kardashian, strolled around the party town of Tulum in a peep hole bikini.
Model Demi, who once dated Kylie Jenner's ex Tyga, visited the beach club in a two-piece bikini that showed off both her cleavage and her washboard stomach.
The star, who has 8 million followers on Instagram, also wore a pair of mirrored shades, a floaty kimono and was carrying a Valentino handbag.
Demi's boyfriend Chris trailed around next to her in a cap, swimming trunks and a big stripy shirt.
American Chris, who is one half of musical act The Martinez Brothers, has been dating the Insta star since 2017.
Demi spends much of her time taking pictures and videos in Ibiza and also has a Kardashian-style app, which keeps fans updated with her latest news.
She's been keeping fans posted with all the action from her Mexico break, sharing eye-poppingly busty photos, as well as shots of her sunbathing topless.
Though she and Chris have a home in Ibiza, Demi has told the Sun she hopes to move to Los Angeles to crack the American market.
She said: "Movies have always been a passion of mine since I went to stage school. But another ambition is to become a Bond Girl, as I love the style and glamour of those films.
"The plan is to move to Los Angeles as soon as I can get a working visa. "I can't be sure I am going to make it but I want to try my best."
A source close to Demi added: "She's got a big fanbase in the US and lots of her fans actually think she's American.
"She'll still mainly be doing modelling and has some big things lined up with famous brands.
"Demi and Chris have already got a place together in Ibiza, but they'll be living together in the US too."
Kylie Jenner lookalike Demi found fame in 2016 when she dated rapper Tyga after he split from Kylie.
Since, then the star has assembled an enormous following thanks to the sexy pictures she posts on Instagram.
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