Pregnant beauties Sienna Miller and Vanessa Minnillo were both recently spotted wearing must-have pieces that are available to buy . . . and you don't have to be knocked up to wear them! While strolling the streets of NYC, Sienna carried Diane von Furstenberg's mini Harper bag in neon yellow ($295) over her neutral ensemble. Then in LA, Vanessa sported an Ella Moss asymmetrical striped maxi dress ($158) with wedge sandals. What's great about these pieces is that they can be worn many ways and in many weathers. Sienna's neon bag would spice up an all-black Winter ensemble just as easily as it would add pop to a floral sundress. And Vanessa's maxi would look equally smashing with a pair of high-heel booties and a circle scarf. If you dig these pieces, be sure to add them to your mix for year-round stylishness.