From Halloween Costumes to Taylor Swift's Album Release, the Best Weekend Celebrity Instagrams

There's less than a week before Halloween and Hollywood is getting into the spooky spirit! This weekend, stars like Kelly Osbourne and Lucy Hale (above, right) donned creative costumes for some pre-holiday festivities while more stars marked other momentous occasions: Kim Kardashian and Kanye West attended a World Series game, while Rita Ora made a surprise guest appearance on Saturday Night Live and Taylor Swift prepped for the release of her new album with collaborator Jack Antonoff (above, left). Take a look at our 10 favorite celebrity Instagrams from the weekend below!

1. Kim Kardashian: "#WorldSeries #Barry Bonds"

2. Taylor Swift:

"Tomorrow [Oct. 27], Jack Antonoff and I will be taking over MTV with wide-eyed wonderment. #TS1989"

3. Kelly Osbourne:"Thank you for being the best #RiffRaff to my #Magenta I love you so much @itsryanrandall"

4. Lena Dunham:"This rack is an honor! Via @mindykaling via Vromans."

5. Lucy Hale:

"This year I go as the Twitter bird."

6. Rita Ora:"SNL tonight! Surprise thank you @thenewclassic and SNL! Black widow wit the squad."

7. Cara Delevingne:

"My first shmore."

8. Naya Rivera:"Mail order ... Happy Halloween!!"

9. Reese Witherspoon:"...Gotta love #GirlsNight..... Hope y'all are having a fun and relaxing weekend :)"

10. Lea Michele:"Happy weekend!!! #freshair #sunshine #happy #healthy"