The 61-year-old commented on his 23-year-old daughter's IG page after she posted a snap from behind showing her without a shirt or pants.
"I’m sorry. What?" he wrote.
In the snap, Ireland is wearing a towel on her head and holding another one in her hand. Baring her bare booty and wearing a nude g-string, she holds up a peace sign while overlooking the New York skyline.
"thank you @sixtyhotels for the beautiful stay. I may never be allowed back but it’s chill," she wrote.
Adding a side note, Ireland joked, "Also my butt isn’t that white. It’s the sun. No it’s also that white."
Alec isn't the only family member who's not feeling Ireland's pic because her Uncle Billy had something to say too.
"Tough one for Uncle Billy to 'like,'" he wrote. "#awkward."
Ireland is the only spawn of Alec and bombshell actress Kim Basinger.
She's the "Saturday Night Live" star's oldest child.
He also is Dad to four other kids -- Carmen, 5, Rafael, 4, Leonardo, 2, and Romeo, 1 -- all of whom he had with wife, Hilaria Baldwin.
She's also the cousin of Hailey Bieber.
This isn't the first time Ireland's pushed the envelope with her dad.
He also lost it when she shared this pic bare backing a motorcycle.
"No. Just...no," Alec wrote, which got lots of attention from Ireland's followers. "LOL Alec freaking out" and "Dad being dad," were just some of the comments.
And if Daddy Alec didn't like those pics, then he really didn't like these.
Last year, his little girl stripped down and lit up for a marijuana-themed promotional video.
Wearing risqué black, laced lingerie, the blonde beauty enjoyed that sticky goodness all to herself.
In the video, directed by Chris Applebaum, Ireland can be seen baking while getting baked, courtesy of cannabis company MedMen.
Before it's release, Alec Baldwin's daughter took to IG saying she "supports marijuana as a healing and medicinal aid," she also believes in "moderation and responsibility."
She was also very responsible in her delivery and warned her 21 and under fans "smoking isn't cool" –- but added she'd gladly roll one with anyone of legal age who likes to light up.