Nicki Minaj performed in front of a sold out O2 Arena in London yesterday - during which time she unveiled her new butt.

According to multiple social media reports, Nicki underwent "butt augmentation" surgery last month. The surgery that Nicki got, called a Brazilian Butt lift, entailed a doctor sucking fat out of her stomach via liposuction - and injecting it into her butt.

And we all know that Nicki's butt already had plenty of fat in it.

The result of the procedure is crazy. Here are some videos of Nicki from last night:

Most of Nicki's fans LOVED her concert and loved her new butt. But now everyone approved of Nicki's antics last night.

Here's what Guardian reporter Al Horner had to say about Nicki's concert:

After a blistering first 15 minutes that peaks with fiery female masturbation anthem Feeling Myself, things starts to sag as her neon-pink, chameleonic hip-pop gives way to lengthy sections devoted to ballads like Grand Piano, mimed from behind a veil, and EDM experiments such as Pound the Alarm.

When she does interact with the crowd, it is to share Mary Poppins-like impressions of Londoners, enquire about which men present have “a giant dick”, and fire subtle barbs at a certain Bronx-born nemesis (“Any of you know someone who copies everything you do all the time?”). At her best, hits such as Anaconda fizz like popping candy, delivered while she is slouched on the ground with a wild-eyed grin like Alice in Wonderland’s Cheshire Cat by way of Cleopatra. But by the time she closes with 2011’s Super Bass to a depleting room (she went on stage an hour late, and last trains beckon), the sugar rush has long since faded.