Starting out with IANAL.
Famous people, whether celebrites or notorious people or the accidentally exposed to publicity, find their right to privacy and anonymity much diluted. Certainly if your reference is not derogatory, your chance of being sued when you mention a famous name is about nil.
As to using people's names at all ...
References to contemporary events and people stamp your fiction with a date.
This can be good.
Dorothy Sayers puts us into the 1920s and 1930s with a sure hand. Having created this, (to her contemporary,) world so well, she became, not dated, but 'vintage' as her references began to become obscure.
Part of our enjoyment in reading Sayers is visiting this distant place and time.
The danger in 'date-stamping' your work
comes when your refs are neither fresh and new and hip
nor nostalgic and delightful.
They are last year's fashion. The dance of two years ago. The three-year-old slang. They are fuddy-duddy.
Unfortunately, the manuscript you write today will appear in bookstores two or three years from now
which is the exact point of fuddy-duddy for many contemporary references.
In addition, popular culture is not merely contemporary, it is compartmentalized.
When I talk about someone wearing Blahniks or Louboutins, this is going to be instantly comprehensible to a specialized audience.
It's going to tick other folks off,
because they have to stop and think about what the devil I mean and they get kicked out of the fictive haze I have been at pains to create.
So, yes, using the name of a soap opera actress is crystal clear and builds a quick, useful, contemporary picture for part of the audience.
But you're losing another part of your prospective audience by being accidentally obscure.
And your actress may not get renewed for next season and be off-the-air and stale news or possibly out of the closet as a trans-gendered male when your book hits the stands.
And you can be just as crystal clear in other ways.