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She finally caved!

Katie Holmes just joined Twitter, and she made her debut on the social media site by sharing a picture from the set of her latest film The Giver.

"So happy to be on twitter!!!!!! Sending first tweets from South Africa," she captioned the snapshot, which also shows cast mate Taylor Swift.

Suri's mom is already catching up to the competition, too!

The actress has only been on the site since this morning, and already she has 15,000+ followers!