"Lost Without U" is the second official single from Robin Thicke's second album, The Evolution of Robin Thicke (2006). The song peaked at #14 on the U.S. Billboard Hot 100, making it Thicke's biggest hit to date. It also remains Thicke's most successful single on the Billboard Hot R&B/Hip-Hop Songs chart, peaking at #1 in February 24, 2007, becoming the first white male artist to reach the top spot on the R&B chart since George Michael in 1998.