Gwyneth Paltrow and Chris Martin Score Insanely Spectacular Mansion

Gwyneth Paltrow is in escrow on one of the most spectacular estates on the westside of L.A. ... and it's costing her and hubby Chris Martin a pretty penny ... TMZ has learned.

The house -- courtesy of famed architect Windsor Smith -- was listed for $10,450,000. We're told Gwyneth and Chris paid close to the asking price.

The house has 6 bedrooms and 8 baths, which means their 2 kids will probably each get their own rooms.

It was built in 2011, and apparently the real estate crash took its toll. The house was originally listed at $11,960,000 in September, 2011, but reduced recently.