Megan Fox and Brian Austin Green 's three kids are transforming into their own people.

Noah , 12, Bodhi , 11, and Journey , 9, looked all grown up as they helped their 3-year-old brother Zane —who Brian shares with fiancée Sharna Burgess —get ready for school. In video shared by Sharna on Instagram Sept. 2, the three cheered on their younger sibling while he held up a sign reading, "Zane's First Day of Pre-K!"

"Is that your sign?" one of the older kids asked off-camera, as Zane showed off his plaque. "Does that say your name?"

As the toddler turned to read the sign, his older sibling cheerfully chimed in, "It says Zane!"

Needless to say, Sharna was moved by the heartwarming family moment.

"My big boy is still little… but today when he woke up he felt a little bigger,

See Full Page