Katie Holmes celebrated her 38th birthday on Dec. 18 with her daughter, Suri Cruise, and we just can't get over how grown up her little girl looks! "Birthday vibes continued ❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️ so grateful today 💕💕💕💕💕💕💕💕💕" she captioned a selfie of her and her 10-year-old on Instagram. This is just the latest we've seen of the duo. Aside from taking casual trips to the MoMa, the two were also joined by Katie's mum, Kathleen, when they checked out the Broadway musical Finding Neverland in NYC. It looks like their sweet mother-daughter relationship just keeps getting stronger.