Kim Kardashian on sis Kylie: 'My muse'

Cindy Clark

USA TODAY

In this Oct. 4, 2012 file photo, television personality Kim Kardashian poses for photographers at the red carpet during the 40th anniversary of Cosmopolitan magazine in Spanish in Mexico City.

Kim Kardashian is slowly re-emerging into the spotlight following the June 15 birth of her baby girl, North West.

The reality-TV superstar made a brief video appearance on her mom's talk show last week, and she's gradually amping up her presence on Twitter. Today's tweet? To wish little sister Kylie a happy sweet sixteen.

"Happy Birthday to my baby sis @kyliejenner !!!! Can't believe your 16! I love you so much!" tweeted Kardashian on Saturday alongside an Instagram photo of Kylie and sister Kendall.

Kardashian, 32, later added a second tweet and photo montage with the caption, "More bday love for my muse & baby sis @kyliejenner."

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