via @justinbieber/Instagram

Swap out the song and this would be a full-on case of deja-vu! Justin Bieber and Lil Wayne served as Floyd Mayweather's official entourage back in September, when they escorted the "Pretty Boy" boxer to the ring as Weezy rapped through "A Milli." 

Last night, Bieber and Lil Wayne returned to Mayweather's side once more at the MGM Grand, except this time "Believe Me," Lil Wayne's new track with Drake, served as Mayweather's pre-bout soundtrack.

Bieber got a little snap-happy taking photos backstage after Mayweather's victory against Marcos Maidana in a particularly grueling fight, as proven by his super enthusiastic Twitter feed.

We're assuming Drake would've been there if he wasn't too busy coming up with the next volley in his fondue-snacking, lacrosse-playing feud with Jay Z, but hey—maybe the Biebs is Mayweather's good luck charm as it all worked out for the best. 

Watch Mayweather make his entrance to "Believe Me" below.