Attach your drop pendant onto a jumpring.
Attach another jumpring to this ring and thread it through the loop on the bottom of the bail.

Take your star pendant, create a wrapped loop with an eyepin - 
- Bend an eyepin up through the star pendants threading hole, wrap the tail of the eyepin around the bit of pin below the eye loop. 
Thread this eyepin onto a jumpring. 
Attach this jumpring to the 1st ring you added to the drop pendant. 

Thread your bail onto your chain.