Sarah Silverman, Eva Longoria and Demi Lovato voice their support for Hillary Clinton
Comic Sarah Silverman joined senator Al Franken on Monday night to urge Democratic National Convention delegates to unite -- then stirred up Bernie Sanders die-hards with some choice words: "To the Bernie or bust people, you're being ridiculous."
As a supporter of Sanders herself, Sarah said she would now vote for Hillary Clinton "with gusto" as she continues to be "inspired and moved to action by the ideals set forth by Bernie, who will never stop fighting for us."
She spoke on the convention's opening day just before Paul Simon stood at a microphone and crooned the Simon and Garfunkel classic Bridge Over Troubled Water.
Singer Demi Lovato got personal at the podium, touching on her struggle with mental illness, including eating and bipolar disorders.
She urged an end to the stigma of those afflicted and called on politicians to support better access to healthcare for all.
"Like millions of Americans, I am living with mental illness," the 23-year-old superstar said.
"But I am lucky. I had the resources and support to get treatment at a top facility. Unfortunately, too many Americans from all walks of life don't get help, whether they fear the stigma or cannot afford treatment." Lovato closed with a performance of her hit "Confident."
Former Desperate Housewives actress Eva Longoria trashed Republican presidential nominee Donald Trump for his statements on Mexican immigrants.
Eva, a Latina from a small town in south Texas, said she is ninth-generation American from a place once owned by Mexico.
"My family never crossed a border. The border crossed us," she said, adding: "When Donald Trump calls us criminals and rapists, he is insulting American families.
"My father is not a criminal or rapist. In fact, he's a United States veteran."
Fans and fashionistas, meanwhile, waited patiently for the dress reveal of first lady Michelle Obama, who spoke late on Monday night.
She wore a bright blue, A-line, cap-sleeve custom dress from American designer Christian Siriano. It was made of silk crepe and included high-belt detailing.
Earlier in the day, Triumph the insulting, cigar-chomping puppet dog joined sweltering street protesters while actress Rosario Dawson urged Bernie Sanders supporters to "listen" to their man.
Actor and activist Danny Glover of the Lethal Weapon film franchise addressed the convention's black caucus, describing Trump as a fascist and urging caucus members to "listen to new voices that demand speaking truth to power".
He and actresses Shailene Woodley and Susan Sarandon joined more than 1,000 people for a climate rally, vowing to keep up the fight on environmental issues even though Sanders, their preferred presidential candidate, would not be in charge.
Shailene urged Sanders supporters to remain calm and Susan thanked him for "igniting this spark".
Boyz II Men performed on the convention stage, while Grammy winner Alicia Keys, who founded a social justice organisation called We Are Here, appeared on a panel on criminal justice reform and civil rights.
Asked about remarks Hillary Clinton made as first lady about urban gangs with "super-predators" -- which she later retracted -- Alicia said: "It's obvious that that was a big mistake.
"If we can admit to our mistakes, that's the beginning, and the question is not only just admitting to the mistake but what are we going to do about it."
Looking ahead to Tuesday, actresses Lena Dunham of Girls and America Ferrera of Ugly Betty are among the notable stars expected to attend a bash hosted by Glamour magazine.