The invention provide a new class of silicone-containing prepolymers containing ethylenically unsaturated groups and latent UV-activated free radical generating moieties. This class of silicone-containing prepolymer is capable of being actinically crosslinked in the presence of one or more hydrophilic vinylic monomers to form a silicone hydrogel material with a hydrophilic surface without post curing surface treatment. The present invention is also related to silicone hydrogel contact lenses made from this class of silicone-containing prepolymers and a vinylic monomer having a latent UV-activated free radical generating moiety.