Well, the modern idea of ācelebrityā is somewhat antithetical to the Christian ideals. . .
but I presume you mean people like Mother Teresa, the late Pope John Paul II, our current Pope Benedict XVIābasically saints and saintly figures.
If you mean people who are ācelebritiesā first by virtue of being entertainers, singers, football players and the like, with the fact of them being āCatholicā meaning no more or less than any other factor, like being black, or left-handed, etc., it doesnāt really matter. Plenty of people who identify themselves as Catholicāor Baptistāor atheist for that matterālive wildly oppositionally to the faith they identify themselves with. And for those who do strive to live according to their faith, that usually matters more for them in their lives than what they receive ācelebrity statusā for. I would think that people like Danny Thomas or the founder of Dominoās pizza (whose name escapes me now) would be more like thatāthey considered themselves Catholics who happened to be in Dannyās case an entertainer, and in the other, a good Catholic man who happened to build a great pizza business.