Jennifer Lawrence was in Monk before she was a major star, and the circumstances of her appearance make it even better. Plenty of famous actors started with small roles on television before they broke big, which is why it isnt difficult to find cameos from names who would one day be major stars in shows from the past. Monk was no exception to this and included both soon-to-be stars and actors who were already big by then.

https://screenrant.com/jennifer-lawrence-monk-role-mascot-explained-funny/