In January 2000, Christina Aguilera’s “What a Girl Wants,” co-written by Shelly Peiken, dethroned Santana and Rob Thomas’ “Smooth” to become the first new Billboard Hot 100 No.
1 of the millennium. It was also the first No. 1 for Peiken, who had previously gotten close as a co-writer of Meredith Brooks’ “Bitch,” which hit No.
2 in 1997 and has logged 56.7 million on-demand U.S. streams to date, according to Nielsen Music/MRC Data. She also co-wrote Aguilera’s next hit, “Come On Over Baby (All I Want Is You),” which reigned at No.
1 on the Hot 100 for four weeks later that year. Since then, she has written songs for Bebe Rexha, Céline Dion, Mandy Moore, Miley Cyrus, Brandy, Demi Lovato, Jennifer Lopez, Backstreet Boys, Ashlee Simpson, Swirl
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