Taylor Swift really made sure her four-night, sold out run at the Staples Center in Los Angeles was star-studded and memorable. She brought out her best and most A-list guest last night (Aug. 24) in the form of Jennifer Lopez. Oh yes, the pop world stopped spinning on it axis for 10 minutes while these two did their thing on 'Jenny From the Block,' which Swift called her "hairbrush song."

Swift intro'ed the song, saying, "When I was a little girl, you know how you have your favorite song that you play over and over again and blast it in your room and you sing in front of your mirror into a hairbrush, right? You have that one favorite song, your favorite one to dance to. Los Angeles, this is my hairbrush song."

That's when La Lopez, decked out in a sparkly pantsuit, appeared on the stage on a riser that ascended from underneath. She didn't say a word, trying to manage a tough, "I used to date future Batman Ben Affleck" look on her face, one that was quickly replaced by a smile she couldn't contain! She was so stoked to be there.

While Lopez's 'Jenny From the Block' persona is not as prevalent as it was when this song was a hit over a decade ago, it was out in full effect with lots of bling and a gilded New York Yankees cap. You can take the diva outta the Bronx...

J. Lo definitely owned this performance, grooving and grinning and working that crowd. Swift was happily following Lopez's lead, jumping and bumping and grinded when J. Lo commanded it.

It was probably the cutest of all of Swift's collabos at the Staples Center, which she has sold out 11 times, a record she now shares with Latin rock group Mana.

The divas exchanged post-perf tweets, too! Feel the love.