Donut planet

Could a planet-sized object be donut shaped? From the definition of the planet, it's:

-is in orbit around the Sun,
-has sufficient mass so that it assumes a hydrostatic equilibrium (nearly round) shape, and
-has "cleared the neighbourhood" around its orbit

If there however was a way for donut-shaped planet to exist, would it be able to hold atmosphere?

Guys I think a planet with the curvature of a Moebius strip would sustain itself because if there is only one side how can the inside collapse inward when it is actually expanding outward??