They've been low-key for the past few months but Bachelorette Ali Fedotowsky and her groom-to-be Roberto Martinez came out in style Saturday night, and RadarOnline.com has the fun pictures.

PHOTOS:  Ali & Roberto Celebrate Halloween

The engaged couple joined Bachelor alums Andy Baldwin, Kiptyn Locke and Tenley Molzahn at San Diego's Hard Rock Hotel where -- dressed as Minnie and Mickey Mouse -- they danced and enjoyed Champagne.

PHOTOS:  Bachelorette Ali Shows Off Her Engagement Ring

Ali and Roberto now call San Diego home.  They've not yet announced a wedding date.

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