Now Playing: Jessica Chastain on advocacy for women in Hollywood

Now Playing: Sarah Jessica Parker launches wedding dress line

Now Playing: How star of Broadway’s ‘Wicked’ left her job in finance to become actress, singer

Now Playing: Bill Cosby faces sentencing for sexual assault conviction

Now Playing: Boy, 6, vanishes during park trip with parents

Now Playing: News headlines today: Sept. 24, 2018

Now Playing: Why Olympic hopeful, who traded sneakers for Army fatigues, became a US citizen

Now Playing: Brett Kavanaugh accuser set to testify

Now Playing: Bus driver appears to allow students behind the wheel

Now Playing: New accusation against Brett Kavanaugh

Now Playing: Tiger Woods wins 1st tournament in over 5 years

Now Playing: Kavanaugh faces new sexual misconduct allegations

Now Playing: The #FlowerVaseHair trend is blooming all over Instagram

Now Playing: Police officer saves driver from an oncoming pick-up truck

Now Playing: Military mom and her young family reunited at last

Now Playing: Bill Cosby is about to become the first celebrity sentenced to prison in the #MeToo era

Now Playing: School bus driver accused of letting students take the wheel

Now Playing: Owner of 3D printed gun-making company is back in US

Now Playing: Fast-moving wildfire forcing evacuations in the West

Now Playing: Kavanaugh accuser agrees to testify before Senate Judiciary Committee