Singles: Shop Boyz Stick, Lil Mama Leaves, Hurricane Chris Rises

The Shop Boyz' Party Like a Rockstar holds strong in second place as Lil Mama's Lip Gloss drops out of the top 10 on the Hot 100 singles chart.

Further down the chart, Hurricane Chris is on the way with A Bay Bay, which rose dramatically from no. 85 to no. 24 off the digital release.  Over on the Hot R&B/Hip-Hop Songs chart, A Bay Bay is no. 12.

Top 10 Singles on the Hot 100:

1. Rihanna - Umbrella
2. Shop Boyz - Party Like a Rockstar
3. Fergie - Big Girls Don't Cry
4. Plain White T's - Hey There Delilah
5. T-Pain - Buy U a Drank (Shawty Snappin') feat. Yung Joc
6. Maroon 5 - Makes Me Wonder
7. Avril Lavigne - Girlfriend
8. Justin Timberlake - Summer Love
9. Amy Winehouse - Rehab
10. Fabolous - Make Me Better

Timbaland's The Way I Are featuring Keri Hilson jumps from no. 40 to no. 18 as the greatest digital gainer on the Hot 100 singles chart and also enjoys the biggest percentage gain on the Hot 100 Airplay chart (40%), propelling it 66-39.