1 of 14
Lou, wow! The giddy toddler (who turns 3 on Oct. 9) stays in step with mom Heidi Klum while shopping in Brentwood, Calif., on June 2.
2 of 14
HARPER & GIDEON BURTKA-HARRIS
Neil Patrick Harris and David Burka's nearly 2-year old twins (Oct. 12) make a matching fashion statement Aug. 2 during a Saint-Tropez, France, vacation.
3 of 14
Well, hello! On Sept. 6, Alicia Keys and Swizz Beatz's little cutie – he turns 2 on Oct. 14 – shares a fun photo op with mom and dad at the MTV Video Music Awards in L.A.
4 of 14
5 of 14
Amy Poehler and her little guy, who celebrates his 4th birthday on Oct. 25, show off their matching smiles July 25 on the Brooklyn, N.Y., set of the actress's new movie, They Came Together.
6 of 14
He's just like dad! At Nickelodeon's annual Kids' Choice Awards on March 31, Travis Barker's look-alike son – he celebrates his 9th birthday on Oct. 9 – shows he's already mastered his dad's cool rocker stance.
7 of 14
Isla Fisher's eldest daughter (she turns 5 on Oct. 17) lets mom – and little sister Elula – lead the way during a family stroll at a Ventura, Calif., farmers' market on Sept. 9.
8 of 14
9 of 14
10 of 14
Jason Bateman's soon-to-be 6-year-old (Oct. 28) – and new big sister! – enjoys a fun Alice in Wonderland-themed ride with dad at Disneyland on March 14.
11 of 14
12 of 14
On Feb. 1, Vanessa Trump gives her little guy, who turns 1 on Oct. 2, a lift and smile during a Big Apple stroll.
13 of 14
14 of 14