On Saturday night in Austin, Texas Jimmy Buffett headlined the Andy Roddick Foundation’s 5th Annual Charity Gala.

John Legend joined Buffett on stage at one point (photo below). Legend tweeted “Just jammed a Bill Withers song with Jimmy Buffett. My life is an adventure.”

On Sunday, Jimmy will perform at the New Orleans Artists Against Hunger and Homelessness 25th Anniversary Gala.

Then on Monday, Jimmy heads to Houston to play a private show for select American Express cardholders.

Jimmy Buffett made a surprise appearance with Mac McAnally and Will Kimbrough on Thursday night at his brand new Margaritaville Cafe in Nashville.

Below are some photos from WSIX Big 98 Country (hat tip Ashley for passing them along):

View all of the photos here.

According to a couple of tweets, Jimmy Buffett made a surprise visit on Thursday night to his new Margaritaville Cafe in Nashville that opened on November 22nd.

“Sitting at Margaritaville in Nashville!!!! Who shows up….. Yes JIMMY BUFFETT!!!! Totally unexpected by the workers and everyone else!!!!” — jscavitt

“Only in Nashville!! Jimmy buffet just walked into margaritaville in nashville!!” — Nashvilleblake

“Jimmy Buffett is in the house at Margaritaville. Like for real. The actual Jimmy Buffett.” — Jenny_Ann

Mac McAnally and Will Kimbrough are playing a show and we expect Jimmy will take the stage too at some point. We’ll provide more information as it becomes available.

Update – Jimmy has taken the stage:

(photo by @Jenny_Ann)

Australian fans have been waiting for over 20 years, but the wait will soon be over. Jimmy Buffett appeared on the Australian Today Show today and announced that he’ll perform at the Sydney Opera House on January 23rd and 24th.

At the end of the recorded message, Jimmy strummed a few lines of Men at Work’s “Land Down Under.”

Tickets go on sale Friday, December 17th at 9 am local. Prices are $169.00 and $119.00. Find out how to gain access to presale tickets here.

Richard Wilkins, entertainment editor for the Today Show, said Jimmy will also play a show in New Zealand while down under.

Update: Video of Jimmy’s announcement below (hat tip @bigbadbyrnes). View a high quality video of the announcement here:

Richard Wilkins, entertainment editor for the Today Show in Australia, tweeted us tonight to let us now that the details will finally be revealed on tomorrow’s show for Jimmy Buffett’s concert in January.

The Today Show allows you to watch live online. So if you’re not in Australia, or you’re on your computer, go to today.ninemsn.com.au and click on Live Online under Watch TODAY Your Way.

For those of you in the US, 7:40 am Sydney time corresponds to 3:40 pm ET.