Amber Rose posted on Twitter pictures of her post-baby body for the first time on Monday and only three weeks after she gave birth to her first child - Sebastian Taylor Thomaz.

Rose, 29, and her fiancé, 25-year-old rapper Wiz Khalifa, welcomed their son on Feb. 21.

Rose tweeted a picture of herself wearing a red dress with a thigh-high slit and a plunging neckline that was so deep, her black lace bra peeked out. The photo's caption read, "Three weeks after giving birth to Sebastian and I feel amazing!" 

Prior to posting the picture of herself, Rose had only been tweeting about her newborn son ever since she gave birth. She wrote on March 7 that her son "is so cool," makes her and her husband laugh all day, and that he is "super silly like me and his dad."

Khalifa also tweeted about his son on Feb. 22: "Bash is so awesome. He makes the coolest faces and hardly cries."

On March 1 Rose announced on Twitter the couple was celebrating three anniversaries: "One year since he proposed, 2 years since I met the love of my life and 1 week since we had our baby boy. Happy Anniversary, Wiz Khalifa. Love you baby!"

Khalifa said in a interview back in November 2012 that he and Rose would get married before the baby is born but will have wedding nuptials for loved ones to attend after she gives birth. He told New York radio station Hot 97 that they will invite family to a ceremony when Rose "could fit into a dress."

Rose called Khalifa her "husband" in a January 2013 interview, circulating rumors that perhaps the couple secretly got married. 

Watch the video below to see Khalifa discuss marrying Rose.

Tags: Amber Rose Twitter picture celebrity baby celebrity couple