Kate Beckinsale is one proud mama!

The actress shared a side-by-side photo of her 17-year-old daughter Lily on her first day of school vs. her "last first day of school" as the teen begins her senior year.

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"Love you so much," the 43-year-old captioned the pic, no doubt embarrassing her only child.

When asked about life with a teen, the brunette beauty previously said, "I had a child young enough that it doesn’t feel too far away from my own experience. I feel like I flunked at adolescence really badly… I think it’s a very difficult time, but she’s doing great.”

To see more celebrity kids all grown up, scroll through the gallery below!