Let's start this Friday right -- with two new music videos from Jennifer Lopez and Justin Bieber!

Both megastars released new clips last night and they're both pretty hot.

First up: J.Lo with "Follow the Leader."

The video starts with a topless Lopez getting out of bed, covered in tattoos. She then plays a dangerous, parkour-filled game of Follow the Leader with reggaeton singers Wisin y Yandel ... who are also featured on the track.

The clip is stunt-heavy and reminds us a lot of "Fast Five," thanks to it's chase scene feel and Rio de Janeiro setting.

It's worth noting that while filming the action-packed video, Lopez was seen on set with a stunt double ... a male stunt double!

Next up: The Biebs, with "Boyfriend."

This video is nothing but hot cars and even hotter girls, as Justin and friends are seeing having a parking lot part in Downtown L.A.

Justin is seen snuggling close to a Selena Gomez look-alike while channeling his inner Justin Timberlake on the falsetto-heavy track.

Bieber even shows off some serious dance moves towards the end.

Which video/song do you like more? Sound off below!

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