Katie Holmes’s baby — daughter Suri Cruise — is 15.

The actress posted an Instagram tribute to her only child, who marked her birthday on Sunday. Along with never-before-seen family photos, Holmes, who’s been raising Suri solo since her 2012 stealth split from ex-husband Tom Cruise, wrote, “Happy 15th Birthday Sweetheart! I love you!!!!!!!! I can’t believe you are already 15!”

Among the beautiful black-and-white photos is one showing a sleeping Suri in Holmes’s arms. Another shows mother and daughter in a super tight squeeze.

Suri’s 2006 birth was a highly-anticipated moment in Hollywood due to the attention paid to her parents, then known as, yes, TomKat. Of course, Cruise talking about buying their own personal sonogram machine and speculation that Holmes would have a Scientology “silent birth” made it all more intriguing.

When Suri was born, paparazzi camped outside the couple’s Hollywood estate around the clock for months hoping to getting the first photo. Those pix ultimately ran in Vanity Fair (“Yes, Suri, She’s Our Baby!” was the cover line) snapped by Annie Leibovitz.

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