Conversation so far:
What was Justin Timberlake's first business venture?
Justin Timberlake has co-owned or provided celebrity endorsement for three restaurants in the United States - Chi, Destino, and Hospitality.
What was Chi endorsed by Justin Timberlake about?
Justin Timberlake's restaurant, Chi opened in West Hollywood, California in 2003.
What other business ventures does Justin Timberlake own besides the restaurants Chi, Destino, and Hospitality?
Timberlake launched the William Rast clothing line with childhood friend Juan Ayala
Does Justin Timberlake also invest in movies?

Question: what is timberlakes most lucrative business venture?
Self-contained rewrite: What is Justin Timberlakes' most lucrative business venture?