The WAG was sporting a pretty nude bikini but threw on the matching kaftan over top as she splashed around in the water and played with her son.
As little Kai followed her into the shoreline, the duo kicked their feet around in the water before Coleen ventured further in.
Splashing about: Coleen Rooney went for a swim in her kaftan and nude bikini while soaking up the sun in Barbados on holiday
But the 25-year-old did strip down to just her bikini later on though, when she wanted to top up her tan and take some photos of her footballer husband and Kai.
Just a few days into their vacation, Coleen took to Twitter to deny reports she is expecting her second child after photos emerged of her on the beach in Barbados.
However, she tweeted to followers that she is not pregnant and is actually proud of her womanly figure.
Meanwhile, Manchester United footballer Wayne was wearing his black swimming shorts and Nike cap as he played around with their youngster in the sand.
Leggy lady: Mrs Rooney showed off her toned legs as she held onto Kai's baby beach toys and strolled through the sea
Fun in the sea: Coleen's 18-month-old son Kai splashed around with her in the water during their day on the beach
The proud father doted on his 18-month-old son before taking a break by lying back on a sun lounger.
When the couple decided to take a break from the sand and sea, Coleen ordered a glass of white wine and grabbed her mobile to tweet: ‘Home next week’.
The Liverpool-born mother-of-one has been a big fan of kaftans on their holiday so far and was spotted wearing a £570 Missoni one the previous day.
Family day out: Footballer Wayne Rooney then came over to join in on the fun with his son and wife
Beach chic: Wayne went down to the sea in black swimming shorts and a Nike cap, while Coleen later took off her kaftan and showed off her nude bikini
Fellow footballers: As Wayne sat in his lounger, he was sitting right next to England goal keeper Joe Hart (front left)
And she tweeted at the start of her holiday: ‘Check out @RumpusResort new website!!! Got some great bikinis for my hols x’
Coleen has put in a lot of effort to maintain her style on the beach, while Wayne has been happy to keep cool and casual.
They have also been away with Coleen’s parents Colette and Tony, who have been helping out with childcare during the break.
Take my photo: Coleen grabbed her camera to make some memories of the occasion with her camera
Down time: Wayne and Coleen took a break from playing in the sand and surf by lying back on their sun loungers and having a drink
Surfs up! Kai grabbed his baby board and headed into the water to practise his surfing techniques alongside daddy Wayne
Cooling off: Coleen finally took her kaftan off and went for a swim in her nude bikini