Check out our rankings below, and be sure to tell us how "Pretty Girls" compares to the others for you.
10. "I Will Still Love You" Don Philip
One of Spears' earliest, this duet off ...Baby One More Time is classic early Spears with her highly recognizable voice on display in a sweet tune about love. Fans even get a couple 'oh oh oh' riffs in there, so while it isn't one of her catchiest, it's not a total wash either. (Never forget: This tune also gave us one hell of an awkward reunion on X Factor!)
9. "Chillin' With You" with Jamie Lynn
A sentimental favorite, one of Spears' latest collaborations (off Britney Jean), with little sister/burgeoning singer Jamie Lynn, is a sweet and contemplative tune about the duo's loving relationship -- but it wouldn't be a Spears original if there wasn't at least some kind of dance breakdown, which isn't quite as successful as the rest of the song.
8. "Tik Tik Boom" with T.I.
This Britney Jean tune followed Britney's later-years collaboration formula (sex + repetition + edgy dance beat), but this was one of the less successful applications: fun while it lasted, instantly forgettable once it was finished.
7. "It Should Be Easy" with will.i.am
Spears most recent and least successful will.i.am collaboration certainly has its fans, but Spears voice is nearly unrecognizable here. While catchy, it feels particularly generic and not up to some of the duo's other high points.
6. "(I Got That) Boom Boom" with Ying Yang Twins
Spears clearly loves the Ying Yang Twins. This In The Zone track gives Spears a harder edge while still allowing her to get down.
5. "Big Fat Bass" with will.i.am
Another standout with will.i.am, one of two collaborations for Femme Fetale finds Spears getting in on the bass game long before Meghan Trainor. While Spears doesn't have a lot to do here, the repetition ensures that the tune easily hit earworm levels.
4. "Pretty Girls" with Iggy Azalea
Spears latest is definitely growing on us with each listen, so we'll stick it near the top for now. The chanting is catchy, and we can easily see ourselves driving around with the top down and this song on blast. (The highest compliment for a Spears track.)
3. "(Drop Dead) Beautiful" with Sabi
Off Femme Fetale, the playful lyrics push this one up the list: "You body looks so sick I think I caught the flu." A great club jam, is it any wonder Billboard recently bemoaned the fact this wasn't ever an official single?
2. "Scream & Shout" with will.i.am
If you weren't paying attention, will.i.am and Brit collaborate together a lot -- with good reason. Spears' iconic sexy drawl has found a great home alongside some of will.i.am's beats, and their different styles complement each other well.
1. "Me Against The Music" with Madonna
A predicable number one? Yes, but with good reason. This was Britney at her absolute peak, going toe to toe with the Queen in an exciting dance number that was sultry and catchy -- and that's without taking into account the iconic music video.
UPDATE: The original version of this article listed "Breathe on Me" featuring the Ying Yang Twins, based on Spotify's listings, but that is a solo Britney track.