A baby Justin Timberlake kicks off this week’s #Throwback Thursday.
<h1>Justin Timberlake celebrated his mom's birthday by posting this adorable photo of the two of them.</h1> <a href="//instagram.com/p/yFdH9iydkq/embed/">//instagram.com/p/yFdH9iydkq/embed/</a>
<h1>Barbra Streisand paid tribute to her former dog Sadie.</h1> <a href="//instagram.com/p/yKi8QFq2YV/embed/">//instagram.com/p/yKi8QFq2YV/embed/</a>
<h1>Rob Lowe reminded us that he is ageless.</h1> <a href="//instagram.com/p/yLCoGGEqrr/embed/">//instagram.com/p/yLCoGGEqrr/embed/</a>
<h1>Paul McCartney shared this photo of himself playing with his daughter, Mary.</h1> <a href="//instagram.com/p/yKkCScTcKF/embed/">//instagram.com/p/yKkCScTcKF/embed/</a>