Music
The rapper climbs three spots to lead this week's tally, 18 weeks after its release.
Behind Khalifa, Bruno Mars slips to two with 'Grenade', while Katy Perry's 'Firework' remains at three.
Dr Dre, Eminem and Skylar Grey's 'I Need A Doctor' debuts at number five, and Far*East Movement and Ryan Tedder's 'Rocketeer' advances nine to seven.
Elsewhere, Chris Brown's 'Look At Me Now', which features Lil Wayne and Busta Rhymes, lands at 11, Nicki Minaj's 'Moment 4 Life' jumps from 27 to 22, and Rihanna's 'S&M' vaults 66 to 31.
Further down the chart, Adele climbs 69 to 64 with 'Rolling In The Deep', and Jessie J's 'Price Tag' enters at number 88.
The top ten singles in full (click where possible for our reviews):
1. (4) Wiz Khalifa: 'Black And Yellow'
2. (1) Bruno Mars: 'Grenade'
3. (3) Katy Perry: 'Firework'
4. (2) Pink: 'F**kin' Perfect'
5. (*) Dr Dre feat. Eminem & Skylar Grey: 'I Need A Doctor'
6. (5) Enrique Iglesias ft. Ludacris & DJ Frank E: 'Tonight (I'm Lovin' You)'
7. (9) Far*East Movement ft. Ryan Tedder: Rocketeer'
8. (6) Rihanna ft. Drake: 'What's My Name?'
9. (7) Pitbull ft. T-Pain: 'Hey Baby (Drop It To The Floor)'
10. (8) Britney Spears: 'Hold It Against Me'
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