Celebrities React to Hillary Clinton's 'Milestone' Victory

— -- The stars are reacting to Hillary Clinton's historic victory Tuesday, when she became America's first female presumptive presidential nominee for a major party.

Clinton reached the delegate threshold needed to clinch the Democratic nomination on Monday night with new commitments from superdelegates. On Tuesday, she won four of six state contests, further solidifying her victory. She celebrated the "milestone" at a rally in Brooklyn.

"Thanks to you, we've reached a milestone," Clinton said during a speech in Brooklyn. "Tonight's victory is not about one person. It belongs to generations of women and men who struggled and sacrificed and made this moment possible."

Before her speech, she told ABC News’ David Muir in an exclusive interview, "It is, of course, symbolic, but symbols mean something, and symbols can often can spark hope and action in people, particularly young people."

But it wasn't just young people celebrating Clinton's achievement.

Today, Barbra Streisand wrote in a statement, "I feel a tremendous rush of pride because this is a woman who is more than qualified to be president. Isn't it interesting how a barrier seems insurmountable -- until it comes down? I hope girls across the country are thinking, 'That could be me.' And like I said after the first woman got a best director Academy Award, it's about time!'

Others took to Twitter to express their excitement.

Chloe Grace Moretz posted a series of tweets.

Cher couldn't contain her enthusiasm.

Nor could her son, Chaz Bono.

Jaime King celebrated the moment with her son.

Earlier, she congratulated Clinton on her victory.

Debra Messing also celebrated with her son.