Justin Timberlake has scored a major double in the US charts - hitting number one with both his single and album. The pop superstar has spent three weeks at the top of the Billboard singles chart with SEXYBACK, and now he's celebrating his first number one solo album. FUTURESEX/LOVESOUNDS has crashed into the top spot after selling 684,000 copies in its first week, toppling Beyonce Knowles' B'DAY in the process. That's a big jump in sales for the former 'N Sync star - his first album, JUSTIFIED, debuted at number two in 2002 with first week sales of 439,000. John Mayer also scores a big debut at number two - his new album, CONTINUUM, enjoyed opening-week sales of 300,000. Beyonce drops to three, while BOB SEGER and Bob Dylan represent the classic rockers - Seger enters the new chart at number four with his first album in more than a decade, FACE THE PROMISE, while Dylan's former number one, MODERN TIMES, rounds out the top five. Lionel Richie debuts at number six with COMING HOME, which marks his first top 10 placing on the chart for 20 years. The only other debut in the new top 10 is The Mars Volta's AMPUTECHTURE, which enters the chart at nine.