Only 13 acts have managed 4 or more #1's. This list is so lolz.
Ties broken by weeks spent at #1, then by whoever got their Xth #1 first.
1. Rihanna
- Run This Town - 2 weeks
- Hard - 2 weeks
- Rude Boy - 2 weeks
- Only Girl - 2 weeks
- What's My Name - 1 week
- S&M - 1 week
- Cheers - 1 week
- We Found Love - 3 weeks
- You Da One - 1 week
= 15 weeks
2. Lady Gaga
- LoveGame - 1 week
- Paparazzi - 2 weeks
- Bad Romance - 4 weeks
- Telephone - 3 weeks
- Alejandro - 2 weeks
- Born This Way - 4 weeks
- The Edge Of Glory - 2 weeks
- You & I - 2 weeks
= 20 weeks
3. Katy Perry
- Waking Up In Vegas - 3 weeks
- California Gurls - 4 weeks
- Teenage Dream - 1 week
- Firework - 1 week
- ET - 2 weeks
- Last Friday Night - 2 weeks
- The One That Got Away - 1 week
- Dark Horse - 1 week
= 15 weeks
4. Bruno Mars
- Nothin' On You - 3 weeks
- Just The Way You Are - 2 weeks
- Grenade - 3 weeks
- Lighters - 2 weeks
- It Will Rain - 1 week
- When I Was Your Man - 1 week
- Uptown Funk - 3 weeks
= 15 weeks
5. Calvin Harris
- Feel So Close - UK Chart
- We Found Love - 3 weeks
- Let's Go - 1 week
- We'll Be Coming Back - 3 weeks
- Spectrum - 1 week
- I Need Your Love - 2 weeks
- Summer - 3 weeks
= 13 weeks
6. Britney Spears
- If U Seek Amy - 2 weeks
- 3 - 1 week
- Hold It Against Me - 1 week
- Til The World Ends - 1 week
- I Wanna Go - 1 week
- Criminal - 1 week
= 7 weeks
7. Ke$ha
- Right Round - 1 week
- Blah Blah Blah - 2 weeks
- Your Love Is My Drug - 1 week
- Take It Off - 1 week
- We R Who We R - 1 week
= 6 weeks
8. P!nk
- Raise Your Glass - 2 weeks
- Perfect - 1 week
- Blow Me (One Last Kiss) - 1 week
- Try - 3 weeks
= 7 weeks
9. Avicii
- Levels - 2 weeks
- I Could Be The One - 2 weeks
- Wake Me Up - 2 weeks
- You Make Me - 1 week
= 7 weeks
10. Little Mix
- DNA - 3 weeks
- Change Your Life - 2 weeks
- Move - 1 week
- Salute - 1 week
= 7 weeks
11. Black Eyed Peas
- Boom Boom Pow - 2 weeks
- I Gotta Feeling - 2 weeks
- Rock That Body - 1 week
- Imma Be - 1 week
= 6 weeks
12. Pitbull
- I Like it - 2 weeks
- DJ Got Us Fallin' In Love - 1 week
- On The Floor - 1 week
- Give Me Everything - 2 weeks
= 6 weeks
13. Flo Rida
- Right Round - 1 week
- Where Them Girls At - 1 week
- Good Feeling - 2 weeks
- Wild Ones - 1 week
= 5 weeks
14. David Guetta
- Sexy Chick - 1 week
- Where Them Girls At - 1 week
- Titanium - 1 week
- She Wolf (Falling To Pieces) - 1 week
= 4 weeks