Yes, D'Artagnian. doctorx is once again correct! The original shot - taken at last year's Playboy New Year's Eve Party is in Martin Solo's reply #650 on page 19 here.
Re: the second half of your query, I firmly believe that this was her last appearance as a professional model:
In 2000, Alexis appeared in "The Wetter The Better," a chapter of D. Kelly Marsalis' "Return Of The Ultra Vixens." Marsalis shlocked it up with cheesy transitions, stage waits and obvious off-camera directions (you can see her saying "okay" 3 times as she crosses the pool.) Despite that and less than 4 minutes of screen time, we get to marvel at Joyce/Alexis' most eye-popping, traffic-stopping, jaw-dropping, fly-busting voluptuousness ever...and get to see how gorgeous she really was in her natural coloring!
She did appear at Glamourcons after 2000. But no longer modeled that I'm aware of.

P.S. IMHO, she's never lost an inch or an ounce of her unique charm as the years have gone by!
