Opening acts and surprise guests

• Sean Kingston (Selected American Dates) (European Dates)
• Jasmine Villegas (Second leg)
• The Stunners (June 23, 2010 – July 28, 2010)
• Vita Chambers (July 2, 2010 – September 4, 2010)
• Willow Smith (UK Dates)
• SoundGirl (UK Dates)
• Bluey Robinson (UK Dates + European Dates)
• The Wanted for 2 UK dates
• Wilson Rivero
• Aaron Kaleta
• Iyaz
• Jessica Jarrell (First leg)
• Burnham (October 19, 2010 – November 17, 2010)
• Poreotics (Asia, Australia, European, and North American Leg) ^[6]
• Bluey Robinson
• Big Time Rush (Mexico)
• The Wanted (Brazil - Sao Paulo dates)
• Cobra Starship (Mexico & South America Leg)

Surprise guests

• Usher (June 23, 2010 and August 31, 2010) (appeared during "Baby" and "Somebody To Love")
• Shaquille O'Neal (August 4, 2010) (appeared during "Baby" during his show Shaq Vs)
• Akon (August 9, 2010 and December 23, 2010) (Surprise Appearance)
• Jaden Smith (August 27, 2010; August 31, 2010; October 8, 2010; and October 30, 2010 and UK Shows) (appeared during "Never Say Never")
• Miley Cyrus (August 31, 2010) (appeared during "Overboard")
• Boyz II Men (August 31, 2010) (appeared during "U Smile")
• Ludacris (August 31, 2010 and December 23, 2010) (appeared during "Baby")
• Diggy Simmons (September 3, and 4, 2010) (appeared during "Baby")
• Mindless Behavior (December 13, 2010, December 19, 2010 and December 21, 2010) (Surprise Appearance)
• Soulja Boy (December 23, 2010) (Surprise Appearance)
• Bow Wow (December 23, 2010) (Surprise Appearance)
• Craig David (March 14, 2011) (Surprise Appearance)
• The Wanted (March 17, 2011) (Surprise Appearance)
• Chris Brown (April 28, 2011) (Surprise Appearance)
• Selena Gomez (October 6, 2011) (Surprise Appearance - "Who Says" performance and a duet with Justin Bieber)