It happened in a scene from this past Monday’s episode of "Two and a Half Men" on Sept. 26, 2011.

Here’s the description given by our good frined Lynette Rice at EW.com’s InsideTV blog: "Less than eight minutes into the…episode…Ashton Kutcher — as the internet billionaire Walden Schmidt — is seen lounging on the couch with his laptop open….Stuck to the top of his computer are a series of bright-colored decals touting specific companies, including ones favored by the actor himself."

The article continues, "Turns out the stickers represent a bunch of companies that Kutcher has a financial stake in — including Foursquare, Hipmunk, Flipboard and GroupMe, as reported by Variety.[Note:Variety is behind a firewall and may charge you to see this article.] Another decal touts the company Chegg, which Kutcher isn’t personally invested in but receives social-media help from the actor’s production company, Katalyst. Look who’s winning now!"

The story adds,  "The network wasn’t compensated for them, and ‘Men’ creator Chuck Lorre was totally down with their usage. But CBS did disclose the Foursquare sticker at the end of the episode, as required by the FCC."

The EW article also says, " ‘This was not part of any advertising transaction with CBS,’ a network spokesman told Variety. ‘Our policy is to disclose such financial interests in a credit at the end of the broadcast.’ "