I don't think of it as 'smelling like' a particular celeb. I just treat them like all the other perfumes. Some perfumier somewhere has to formulate them, you can bet your life that has nothing to do with the particular celebrity in question. They may be vaguely involved in the final selection of the various scents provided to them by their chosen perfumier, but that would be the sum total of their involvement, I would think. And if I like the smell, and it sits well on my skin, I'll buy it. But I only own and wear one - JLo Glow - which I absolutely adore. It was my SOTD for over a year, and caused many a compliment when I wore it to work. JLo Glow has just gone into its fifth year of production - and to be on the safe side, I have an unopened, still cellophaned bottle in my collection, in case it should be discontinued (which doesn't look currently likely). I've sampled others, and quite liked Gwen Stefani's LAMB - but not enough to buy it.
My view with all perfumes is to maintain an open mind and a pair of open nostrils and never write something off because of the name on the packaging or how ugly (or indeed beautiful) the packaging may be. If it smells great, buy it, slap it on, and wear it with pride.