Celebrity Britney & Kevin: A United Front Spears and Federline stick together during a Father's Day trip to Miami By People Staff Published on June 21, 2006 03:20 PM Share Tweet Pin Email Photo: BAuer-Griffin Britney Spears and Kevin Federline are keeping up their newly reunited front. Over Father’s Day weekend, the couple were in Miami, where they spent Saturday aboard a rented yacht and took in the NBA finals’ Game 5 between the Miami Heat and Dallas Mavericks on Sunday, PEOPLE reports in its new issue. Even when a solo Federline hosted a bash at the South Beach hot spot Mansion on Friday night to promote his album, “he was on his best behavior,” a clubgoer tells PEOPLE. (He did manage to have a little fun, hitting the turntables and celebrating a pal’s birthday with cake and Cristal.) The couple’s togetherness comes on the heels of Spears’s Dateline interview with Matt Lauer, during which she shot down rumors of marital trouble and called Federline an “amazing” husband. “He cares so much, and his heart is awesome,” she said. “He has a really big heart, and I love that.” On June 11, the couple were photographed together for the first time in two months, when they went for a stroll in Malibu with their 9-month-old son Sean Preston. “Kevin would talk to Sean and then break out into song, making up the lyrics as he went along,” a witness told PEOPLE at the time. “It made Britney laugh.” The couple are expecting their second child together in September.