08/05/2012 AT 04:15 PM EDT
New moms make huge sacrifices. Just ask Jessica Simpson
"Responsibility has drastically changed my life!" she wrote on Twitter
. "Saturday night drink of choice.... WATER!"
Punctuated with a happy face, the singer-turned-fashion mogul's Tweet implies she's not missing any other beverages, though that wasn't always the case.
"I'm a free-spirited girl, but giving up my scotch? My Macallan 18? That was hard for me!" Simpson, who turned 32 last month
, told ELLE
of getting pregnant
with her first child, daughter Maxwell Drew
Since giving birth May 1, Simpson has been working very hard
at losing her baby weight, joining Weight Watchers
and using a pedometer
Drinking water instead of scotch certainly can't hurt either!