Former Hear'Say singer Kym Marsh will take to the stage during Southern FM's Party in the Park on Sunday.
The 27-year-old, who is dating former soap star Jack Ryder, released her debut solo single Cry in April after an acrimonious split from her Hear'Say band mates.
Her new album will come out next month. Other acts booked so far include the Cheeky Girls and Blazin' Squad, Atomic Kitten, Girls Aloud, Daniel Bedingfield and Mis-teeq.
Acts already announced for the free show, which lasts from noon to 4 pm, include Sugababes and Mis-teeq.
The remaining stars who will be topping the bill will be announced during the week and towards the weekend, work will begin on constructing the huge stage which will be erected in the middle of Preston Park.
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