Anne Hathaway reveals she's giving up drinking for the next 18 years

Anne Hathaway just announced a major goal: She's planning on staying sober for the next 18 years.

In an appearance on "The Ellen DeGeneres Show," airing Tuesday, the actress revealed she quit drinking in October. Right before then, she had been touring rum bars while visiting Mauritius, an island east of Madagascar, with her "Serenity" co-star Matthew McConaughey and his wife, Camila Alves.

"Wow, and how was that?" DeGeneres asked.

"I don't remember," Hathaway replied, laughing. "I have no idea." 

She continued: "They're both cool, and I just can't drink as much as them. We drank the night away, and then I had to go to a meeting with Steven Knight, our director, the next day, and I was just kinda – have you guys ever had to do a meeting hungover? I was just kinda stumbling in with one eye open and I was trying to convince him about certain things about my character."

At the end of the meeting, Hathaway confessed she was hungover.

"He just goes, 'oh, really? I couldn't tell,' " she recalled. "And then two days later we had another meeting and I showed up and he said 'oh, now I can.' " 

Since then, Hathaway has decided she'll stay sober at least until her 2-year-old son, Jonathan, turns 18. She estimated she will stay sober for "18 years."

"I’m going to stop drinking while my son is in my house just because I don’t totally love the way I do it and he’s getting to an age where he really does need me all the time in the mornings," Hathaway continued. "I did one school run one day where I dropped him off at school, I wasn’t driving, but I was hungover and that was enough for me. I didn’t love that one."