Bottoms up.

A booze behemoth says millennials are drinking alcohol at an increasing rate thanks to a stressful new addition to their generation: children.

Constellation Brands Inc. — which owns parent-popular brands such as Corona and Mondavi — reports that the average millennial consumed about 24 drinks a month in 2013, back when they were young and wild and free. But this year? They’re up to 29 drinks a month on average.

The company’s CEO David Klein shared the stat during an interview at the Barclays Global Consumer Staples Conference in Boston after an analyst suggested the rise in booze consumption could have something to do with the fact that millennials have kids now.

“Well, I think that’s exactly the answer,” Klein said, according to transcripts from the event. “And what we don’t know though, is: Will we see that same thing with Gen Z as they age, will life get more stressful for them, and they drink a little more? But it’s too early to tell, but we definitely have seen that with millennials.”

While surely the increase has benefited Klein’s pockets, it’s become dire for some millennial parents. Addiction experts report seeing more and more parents come in for treatment — especially mothers — as they turn to the bottle to cope with the stress of raising children, having a career and taking care of the household.

Between 2002 and 2013, the number of women who consumed more than four drinks a day rose almost 60%, while those meeting the criteria for alcohol use disorders — indicative of problem drinking — increased by 84%, according to the National Epidemiologic Survey on Alcohol and Related Conditions.

The rise is fueled in part by messages in pop culture championing mommy boozing. Singer Kelly Clarkson recently told People magazine that, as someone raising four children, “wine is necessary.” Etsy is filled with crafts emblazoned with cute, sassy messages about how raising children requires you to pour yourself a glass or three. The Facebook group “Moms Who Need Wine” has nearly 728,000 members.

Carrie Wilkens, co-founder and clinical director of the Center for Motivation and Change in Midtown, told The Post last year that many women seeking treatment have children.

“Lots of people drink in response to stress, and mothers are not immune to feeling like an extra glass of wine will help them unwind at the end of the day,” she says. “If you’re getting together to drink, odds are, seven of those women will be fine but there will be someone in the group [who’s] struggling.”