Tennis star Serena Williams launched a classic sexy black dress with a twist on Thursday.

Released on Serena's clothing line brand 'S', the little black dress comes with a built-in mask.

'I am staying sexy with a bit of protection this summer in this little black dress by @serena hurry they are going fast. Built in mask – check,' women tennis' GOAT captioned her Instagram pix.

The outfit is practical, stylish and perfect -- so absolutely Serena!