What is the current divorce rate among celebrities, and how can one
find other related statistics about celebrity marriages?

99.99%

This article might be of interest to you:

http://www.suntimes.com/output/news/cst-nws-divorce16.html

I knew this question sounded familiar. . . it's the same as the very
first one I ever asked on Google Answers.

Here's the link below.   You'll notice that we got caught up in the
stumbling block as to the definition of a celebrity marriage.  Do both
partners have to be famous?

Anyway -- here's what esteemed researcher Tutuzdad-ga came up with. 
Maybe some of this can be of help to you.

http://answers.google.com/answers/threadview?id=174336

Thanks, cryptica-ga for sending me that link.  It was very helpful.  I
got some insight into WHY celebrities divorce.  The only thing I would
say at this point is I'm not satisfied yet - there are a lot of opened
questions:

1)  What is the celebrity divorce rate?  (I know it's 50% for all Americans)
2)  If the celebrities have a higher divorce rate, do they also have a
corresponding higher "marriage rate" to compensate?  (Number of times
married in life)
3)  To sum things up, are celebrities generally more likely to live
and die single than the average American citizen?  (Will they spend
more years of their life without a partner?)
4)  Are celebrities generally more psychologically unhappy than the
average American citizen, as a result of #3?

I upped the pay for this question.  If anyone can answer questions 1,
2, 3, or 4 I'd be ready to close this.

Bill0917 --

Gee, I  hope you get your answers.  But as you can see from my old
question that Tutuzdad worked on, it's very difficult to find the
definitive facts & percentages you're asking for.  You can get a lot
of anecdotal data, but stats?   Maybe that's why Tutuzdad hasn't
jumped (so far) on YOUR question(s).  They may be unanswerable.

There IS one snippet from Tutuzdad's research on my old question  that
would "sort of" work for your Question #1, re the divorce percentage
among celebs.  He found an article quoting top celebrity divorce
lawyer Raoul Felder, who said he estimates the celeb divorce rate at
80%.

Yes - thanks, again, cryptica-ga, I did see that comment about the 80%
divorce rate.  Although, it seems to me that that guy who said it was
going purely by an anecdotal estimate.

On the other hand, the graphs we were looking at for divorce rate by
age in the Suntimes article seemed more scientific and useful, but I
think the way the "older than 70" divorce rate was calculated is
innaccurate.  Why were there so few celebs on the list older than 70? 
Surely there are the same proportion of celebs that exist that are
older than 70 as in the general population. (if not more, because I be
they are more vibrant and healthy)  Nevertheless - that "100% divorce
rate for celebs older than 70" thing REALLY disturbs me - if anything
at this point, I'd love for Tutuzdad-ga help me to debunk that ONE
myth.

Bill!  
There's nothing truly "scientific" about the Sun Times article
because look at how UNscientifically it's skewed.  
The asterisked ** footnote says,

"Stars ranked according to their popularity 
on Internet Movie Database searches."

In other words, the "200 most popular celebrities" criteria 
has to do with what people happen to be looking up on imdB.
Which explains why you don't see a lot of celebs over 70 
in the article, since more people are looking for contemporary
stars.

But 100% divorce rate for celeb marriages for the Over 70 crowd?
No way!  Here are several that I just thought of off the
top of my head that will "debunk that myth."  And they're not on the 
imdB list either.  

ALAN ALDA (70): Married to photog Arlene Alda since 1957.  (49 years)

ROBERT ALTMAN (director)Divorced twice, but has been married to
Kathryn Reed since 1959 (47 years).

WILLIAM H. DANIELS & BONNIE BARTLETT (he's 79):  Both are actors. 
Married since 1951. (55 years)

RICHARD BENJAMIN & PAULA PRENTISS (OK, I'm cheating, he's only 68): 
Married since 1961.  (45 years)

JERRY STILLER & ANN MEARA (he's 79):  Married since 1954  (52 years)

ELI WALLACH & ANNE JACKSON (he's 90):  Married since 1948 (58 years)

CARL REINER & jazz singer ESTELLE REINER (he's 82):  Married since 1943
(63 years)

Wow!  Thanks a lot for that update about the married celebs over age
70.  That really relieved me, and also makes me think that the
Suntimes graph needs to be revised quite a bit!

I've upped the amount for this question because I want my answer
refined.  I'm looking for a new article that is more statistically
accurate than the Suntimes article, or, a way of calculating the
statistics myself.