Gwyneth Paltrow spent Monday night at New York's Mount Sinai Hospital for reasons unknown, according to

A witness reportedly revealed to Us, "She was slumped over in a wheelchair pushed by [husband] Chris Martin" and "looked not well."

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A representative for Paltrow told Us, "We are not commenting as it's a personal matter."

Paltrow has now returned home, her rep told OK! magazine.

"Gwyneth is fine and at home — we are not commenting further," Stephen Huvane said.

The actress has two children with Coldplay lead singer Martin: Apple Martin, 3, and Moses Martin, 1.

She is most notable for her role in the 1998 film "Shakespeare in Love," for which she won an Oscar.