== Track listings and formats ==;CD single#"Girlfriend"#"Alone";Japan CD single#"Girlfriend" (Radio edit) – 3:38#"Girlfriend" (Instrumental) – 3:36;Junkie XL remix digital download#"Girlfriend" XL Mix - 3:41#"Girlfriend" XL Extended Mix - 5:44;Dr. Luke remix edition only#"Girlfriend" (Dr. Luke remix, featuring Lil Mama) - 3:25#"Girlfriend" (album version) - 3:36#"Girlfriend" (original music video) - 3:48#"Girlfriend" (Dr. Luke remix, featuring Lil Mama) video - 3:25;Ringle edition#"Girlfriend" (Dr. Luke remix, featuring Lil Mama)#"Girlfriend" (Japanese version) edit#"Keep Holding On"#Ringtone11 A code was included on the CD to download the ringtone online.
;Worldwide edition# «Girlfriend» Version# «Alone»;Japanese edition(4988017647615; Released March 21,2007)# «Girlfriend» Edit# «Girlfriend»;Junkie XL remix digital download# «Girlfriend XL Mix»# «Girlfriend XL Extended Mix»;Dr. Luke remix edition only# «Girlfriend (Dr. Luke Remix)» (featuring Lil Mama)# «Girlfriend» Version# «Girlfriend» Music Video# «Girlfriend Luke remix» Lil Mama Video;Ringle edition# «Girlfriend (Dr. Luke remix)» Lil Mama# «Girlfriend» (Japanese version) Edit# «Keep Holding On»# Ringtone11 A code included on the CD to download theringtone online.