By JOSE MARTINEZ DAILY NEWS STAFF WRITER

Cheers to the Bush twins, who turn 21 today and can finally throw away their fake IDs.

Jenna and Barbara Bush, whose hijinx have given their presidential father headaches, will finally reach legal age and can have a cocktail without worrying about the cops.

The fraternal twins — Jenna is a sophomore at the University of Texas, Barbara is at Yale — are planning a huge party at the Bush ranch in Crawford, Tex.

Here are a few words of wisdom:

Burn the fake ID cards.

Go back to Austin's margarita palace, Chuy's, where the bartender called the cops on you. Tipping is optional.

Since you are a Bush, beware of pretzels.

Listen to advice from your family — except for cousin Noelle. Don't drink anything that comes in a fish bowl.

Every time dad uses the word "evil" in public, down a shot.

Swap nights in the Lincoln Bedroom for drinks on the house.

Leave the public hurling to your grandfather.

When the party's over, go cow-tipping in your own backyard. Secret Service agents aren't just third wheels — think of them as designated drivers!