My suggestion is there's no right answer until you try out yourself.
If I were you, I will try to expand out the male celebrities website. Make it even bigger. Invest more time in it. While in the meantime, spend the rest of the time exploring other niche.
Always look at the option of growing your existing site to its maximum potential. Here's a great article from John Chow:
Big Sites Rules, Small Sites Drool « John Chow dot Com