Spencer Pratt dropped into Malibu to visit his 'estranged' wife Heidi Montag this week, and in the process, accidentally blew the whistle on their sham separation, Breaking Celebrity News has exclusively learned.

A source tells Breaking Celebrity News that Spencer showed up Wednesday at Heidi’s million-dollar beachside hideaway, just days after their so-called split.

But instead of break-up blues, as you would expect when an ex turns up unannounced, our source tells us there was nothing but beaming smiles.

“Heidi and Spencer are obviously still on speaking terms,” dished a source to Breaking Celebrity News.

“I would be surprised if he isn’t even living at the house."

The fame-hungry couple “announced” last week that they were splitting.

“There are so many lies out there about me and I just needed space – even away from my husband,” Heidi said, in confirming the so-called split.

“I needed some alone time... I've always loved Spencer, but right now we're working on things.”

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But as Breaking Celebrity News was first to report, suspicions were aroused it was nothing more than a publicity stunt, when Montag’s swift living arrangements were exposed.

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Not soon after the supposed break-up, Heidi confirmed she was moving in with her pal Jennifer Bunney to film an upcoming reality show.