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Dakota Fanning

Coourtesy Cashman Photo

It may be belated, but Dakota Fanning's big birthday trip seemed well worth the wait.

The actress turned the big 2-1 in late February but didn't really celebrate until last weekend when she jetted off to Las Vegas. Fanning and her family went to watch America's Got Talent Terry Fator's show at The Mirage, "The VOICE of Entertainment."

Apparently, Dakota and the fam watched Fator, who does celebrity impressions through ventriloquism, when he was on the show, so why not see the real deal in Sin City, right?! "Dakota and her family were fans of Terry from America's Got Talent and Dakota really wanted to see him," a source tells E! News.

Especially when your entire birthday weekend is paid for by one very famous pal...

E! News learned that a Hollywood icon, who has worked with Dakota in the past, promised to foot the bill for her birthday weekend. Can you take a guess as to who it is? C'mon, just name anybody. Granted, we can't hear your response, but we're gonna guess that whatever name you threw out there is wrong.

It's nothing personal, it's just a tough question.

The answer is Steven Spielberg! A source tells us, "Steven Spielberg had promised Dakota he'd pay for her trip to Vegas for her 21st birthday! It was something he promised when they filmed War of the Worlds. Apparently they've kept in touch and he followed through with his promise."

Aw, we love that! A specfic dollar amount for Fanning's birthday weekend has not been revealed, but as we all already know, it's the thought that counts. Right, guys?!

—Reporting by Sara Kitnick