Vanessa Hudgens is pregnant, and she let the world know in the biggest way possible -- showing up to the Oscars ... with a big ol' baby bump in tow!
The actress is one of the hosts on the red carpet Sunday at the Dolby Theater in Hollywood -- where the ceremony will be going down later today -- and before all the stars arrived to take their own pictures ... Vanessa made sure to steal the spotlight with shots of her own.