Britney Spears and Justin Timberlake
Britney and Justin share a natal Venus conjunction. While this aligns their romance planet in a position of similarity, and it is probably the main relationship indicator here, this is a passive connection (Venus being a passive planet). A slightly wider trine from Spears' Mars to Timberlake's Venus is supportive, but this pattern is sometimes more effective between the male Mars and female Venus.
http://en.wikipedia.org/wiki/Justin_Timberlake