The soccer star - who was dumped by the Girls Aloud beauty after revelations he cheated on her during their four-year marriage - is attempting to persuade Cheryl to give their relationship another go so he has ordered the huge tub for their marital home in Surrey, South East England, as he thinks it will be the perfect present for her 28th birthday on Wednesday (30.06.11).
A source told The Sun newspaper: "Ashley reckons he's thought of the best present to show Cheryl how much he still cares about her. He's been racking his brains recently trying to think of a gift and some of his teamates at Chelsea use the flotation tanks.
"This will almost be a first step to having some of her belongings back in the house."
Cheryl - who was fired from her role as a judge on the American version of 'The X Factor' - is said to be on the verge of giving Ashley another chance after telling friends she still loved him.
However, she may decide to have a re-think after pictures emerged of the 30-year-old sportsman flirting with a bevy of beauties at a Los Angeles nightclub during his current vacation.
An onlooker said: "A series of girls were allowed into the area Ashley and his friends were sitting in. Ashley was loving the attention. First he was chatting to a brunette, then a blonde."
But sources close to Ashley say Cheryl is the only woman for him and has deleted every girl's number from his phone to show how much she means to him.