Hello, and welcome to another installment of Know Your #B9.

The last time The Legendary Miss Britney Spears allowed us to take a peek behind-the-scenes of her forthcoming follow-up to her Most Personal Album To Date, 2013's Britney Jean, she was chillin' with UK producer Burns and singer-songwriter/vocal producer Mischke.

After gushing about laying down vocals on a song that she JUST LOVES last week, the exceptional earner decided to give the Britney Army/Godney Warriors/Spearleaders a post-Halloween treat last night by teasing two new, very exciting collaborators now working on her ninth studio album: Justin Tranter and Julia Michaels.

"Working hard and hardly working...new album...wheeeee!," the Holy Spearit declared on Instagram.

But who exactly are these two getting silly in the studio with the Living Legend™ herself? Let's dive right in.

If you happened to be in one of the first few rows of Lady Gaga's Monster Ball Tour, you might already recognize Tranter as the frontman of glam rock troupe/tour openers, Semi Precious Weapons. (Their song, "Aviation High," remains excellent.)

After signing a publishing deal with Warner/Chappell Music a few years ago, Tranter began co-penning tracks for pop acts, including Fall Out Boy's "Centuries."

Julia Michaels, on the other hand, got her start in pop world by collaborating with songwriters and working on TV show promos, including the theme song for Disney Channel's Austin & Ally, "Can't Do It Without You." She also co-wrote the very amazing, Troye Sivan-assisted "Papercut" on Zedd's True Colors, among others.

After the two began writing together, they've hit what has now become an unbelievably hot streak, co-penning a bunch of solid pop smashes — many of which have come out in just the past few weeks: Gwen Stefani's "Used To Love You," Justin Bieber's "Sorry," Pia Mia's "Touch," Hailee Steinfeld's "Love Myself" and about half of the records on Selena Gomez's Revival, including "Hands To Myself," "Me & The Rhythm" and her whisper-soft sensual smash, "Good For You."

It's hard to guesstimate exactly what the session(s) with Justin and Julia could possibly sound like given their incredibly diverse collection, but the fact that all of these songs just happen to be fire? Things are looking pretty good for B.

The two now join Matthew Koma as confirmed collaborators on B9, who recently spoke to us about working with Britney.

Until the next update from the studio...

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