6. Lawson Bring US Rapper B.o.B On Stage During Their Set

This image appears in the gallery:
Summertime Ball 2013: 15 Best Moments

1. 
2. 
3. 
4. 
5. 
6. 
7. 
8. 
9. 

10. 15 images

See the full gallery: Summertime Ball 2013: 15 Best Moments