Article continues below advertisementBritney Spears still thinks about Justin Timberlake.The pop star, 43, stripped down to a skimpy green and yellow bikini while bopping along to Manon Dave's remix of Timbaland's "Carry Out," which features her ex.Spears stuck her tongue out as she flaunted her figure aboard a boat on Wednesday, August 20.Article continues below advertisementSource: @britneyspears/InstagramBritney Spears dated Justin Timberlake from 1999 to 2002.The singer was all smiles as she ran her hands through her hair and shook her head to the track, which peaked at No. 11 on the U.S.