This week's top 20 countdowns welcomes two superstars: Justin Timberlake and Britney Spears!

JT is riding on the success of his second album release of the year. 'TKO' is the latest in a string of hits the singer has dropped in 2013. The track enters the chart this week, but Justin definitely has the pizazz to take it to the top spot.

Joining Justin on the top 20 countdown is his former GF, Britney Spears. Brit's been in comeback mode this year and her new song, 'Work Bitch,' proves she's here to stay.

Check out the full top 20 below!

Top 20 Songs: Week of September 30 - October 6, 2013

20. Tegan & Sara, 'Closer'
19. Justin Timberlake, 'TKO'
18. Bruno Mars, 'Gorilla'
17. Britney Spears, 'Work Bitch'
16. Robin Thicke, 'Give It 2 U' Feat. Kendrick Lamar
15. Miley Cyrus, 'Wrecking Ball'
14. Maroon 5, 'Love Somebody'
13. Selena Gomez, 'Slow Down'
12. Paramore, 'Still Into You'
11. Macklemore + Ryan Lewis, 'Same Love'
10. Calvin Harris Feat. Ellie Goulding, 'I Need Your Love'
9. Drake, 'Hold On, We're Going Home'
8. Zedd, 'Clarity' Feat. Foxes
7. Robin Thicke, 'Blurred Lines' Feat. Pharrell
6. Lady Gaga, 'Applause'
5. Lorde, 'Royals'
4. Capital Cities, 'Safe and Sound'
3. Lana Del Rey, 'Summertime Sadness'
2. Avicii, 'Wake Me Up'
1. Katy Perry, 'ROAR'

Note: Every Monday, PopCrush will publish a list of our Top 20 songs for that given week. Then, over the weekend, fans can tune in to our national radio show to hear all of these hot songs plus some other amazing pop tunes. To see a list of radio stations where you can hear the PopCrush Top 20 countdown, click here.