This song hit number five on the Billboard Hot 100 and became Bedingfield 's first top ten hit single in the United States . This single and Pocketful of Sunshine are among Bedingfield 's most successful singles . `` Unwritten '' is Bedingfield 's most successful single in the US , along with `` Pocketful of Sunshine '' ; both songs peaked at number five on the Billboard Hot 100 .