By Laurel Brown for MailOnline, « Britney Spears gets a surprise visit from Aerosmith's Steven Tyler at Las Vegas show », Daily Mail, (lire en ligne, consulté le ).
(en) Charlie Campbell, « Britney Spears Extends Multi-Million Dollar Las Vegas Run », sur time.com, (consulté le ) : « The pop singer already made bank from her two-year residency at the Axis Theater at Planet Hollywood, but a new report claims Spears will be paid another $12 million to extend her run another 30 dates through Christmas 2016. »
