Kelly Rowland has written a lullaby for her baby son.

The former Destiny's Child singer - who gave birth to her first son, Titan Jewell, with her husband Tim Witherspoon last week - has already penned a song to the tot and posted a preview of the track on her Instagram account.

Along with the song clip, which features the line, ''You will always be mommy's little baby'', Kelly, 33, shared a cute photo of her son being cradled.

The full track - which was produced by Verse Simmonds and The Order - can be listened to in full on the singer's Sound Cloud page.

In addition to penning the heartfelt tribute to her first born, the raven-haired beauty has also been welcoming a host of visitors to meet the new edition to her family including her former band mate Beyonce.

The 'Crazy In Love' hitmaker gushed over Titan upon meeting him for the first, adding there was ''no better feeling'' than holding the baby in her arms.

She wrote on her Instagram account along with a photo of a woman's hand being grasped by a baby's fingers: ''There's no better feeling than holding my beautiful nephew. I thank god for the honor of witnessing my sisters journey into motherhood.(sic)''

The 33-year-old star - who has a two-year-old daughter Blue Ivy with her rapper husband Jay Z - also confessed it was a dream come true for Kelly to have given birth to a pal for her own daughter to grow up with.

She said: ''I've always dreamt of our little ones growing up together. I'm so thankful for our bond. Baby Ty, I love you so much. Congrats to my Spoons.''