Things might get a little awkward if you see your brother's butt on Instagram, but Kate Hudson took it in stride [1]. It all started when Oliver Hudson posted a completely nude picture of his backside while he was overlooking a mountaintop on Sunday. "No place like home... #notanlines," he captioned the snap. It didn't take long for Kate to notice and comment on the photo, writing, "Is this really necessary?" Kate seemingly knew it was only a matter of time until Oliver posted something ridiculous, as she gave the public a warning after her brother joined the social media site. "I would like to take a moment to introduce my big brother @theoliverhudson to Instagram," she wrote in a post on Jan. 9 [2]. "I apologize for him in advance... If you're into chest hair selfies and golfing pics, he's your guy. Happy he has taken the leap to Instagram and I already know that myself and my other brothers will be at the mercy of his public account because that's just how he works. I'm afraid, very afraid...but bring it on [3] Hudson! #LoveMyBrothers #OliverHudson."

It's just the latest in a string of recent funny moments for Kate, who had her butt grabbed by Jennifer Aniston [4] at the Golden Globes and participated in a dance battle with her family [5] over Thanksgiving. Scroll through to see her brother's NSFW picture!