The Insider.com

Dean McDermott may need a crash course on the proper etiquette when it comes to social media.

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8 hours ago, Tori Spelling's hubby tweeted an adorable photo of their son, Liam.

The only hitch? The shot also happened to capture a totally bare-breasted Tori in the background! He must feel like such a boob!

If you haven't seen this LOL moment for the internet age, click here -- warning, NUDITY!