And making sure to highlight the occasion, Becky shared a gorgeous photo of herself and Summer in the water to Instagram. So cute, right?
In her photo, Rebecca is pictured holding her baby girl in her arms and the olympic gold medallist looked just incredible in her ruched pink bikini. Summer, meanwhile, cut an adorable figure in her navy, polka dot swimsuit and seemed pretty chuffed with herself for joining her mum in the open water.
Relishing the chance to give us all a bout of holiday envy with her snap, Rebecca wrote alongside her photo: "This is pay back to all those who went on holiday in the summer and made me so jealous! Took Summer [in] the sea for the first time, she loved it!"
Rebecca's photo comes after she and her husband Harry Needs revealed they were taking little Summer on her first family holiday.
And the ambitious couple ruled out a quick trip to somewhere nearby, instead jetting to Antigua for some serious winter sun. Luckily for them, Summer was a total pro at flying and occupying herself for several hours on a plane was no problem as she had the best seat in the house.
Harry shared *the* cutest picture of the five-month-old tot aboard the plane and judging by the smile on Summer's face, she's a huge fan of the jet-setter life.
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