Jessica Biel Joins Twitter & WhoSay

Jessica Biel chats on her cell phone while heading to an office building on Wednesday (May 9) in New York City.

The same day, fiance Justin Timberlake waved to photographers while arriving at a hotel.

Earlier in the week, the couple made their first official post-engagement appearance at the 2012 Met Ball.

“I can’t zip up my dress. Welcome to my world! #MetBall,” Jessica, wearing a Prada piece, wrote as her very first tweet. She also recently just created a WhoSay page!

Follow Jessica and JustJared on Twitter @JessicaBiel and @JustJared.

Also pictured inside: Jessica leaving Cafe Gitano on Tuesday (May 8), while Justin was spotted outside his hotel.

15+ pictures inside of Justin Timberlake and Jessica Biel out separately in NYC…