Question: Who's baby is georgina on gossip girl?

Disambiguated questions and answers:
context: In the season premiere "Belles de Jour" it is revealed Georgina had a son, Milo, born on July 7, 2010, but it is unknown if Dan Humphrey is the father at first because they never did a DNA test. Georgina then gives a fake DNA test so that Dan will sign Milo's birth certificate. It is later revealed to be another one of her schemes when she abruptly leaves New York, leaving Dan alone with Milo. She left a note saying that she went to the "spa". Whilst she is away, Rufus does a DNA test himself, and breaks the news to Dan that he isn't Milo's biological father. In the episode "The Undergraduates", Georgina returns from the "spa" (she was in fact in St. Barts) to collect Milo, and ends up telling Dan about Serge, Milo's "real" father, because he knows that she has been lying. She also declares that she and Milo are going to live with Georgina's parents. Georgina returns in the season finale attending a Constance Billiard alumni dance. She reveals to Serena that she is living in Bedford, New York and is now married, but bored, from the lifestyle she sought to raise her son in. Georgina seeks to maintain her need to scheme as she offers her aid in catching Charlie, finding out later that she has her own agenda - one that Georgina takes interest in. She offers her home phone number to Charlie and tells her to give her a call in case she ever needs her.
question: Who is Georgina's baby's father on Gossip Girl?
short_answers: Serge
wikipage: Georgina Sparks
context: After Blair's wedding, Georgina locks Dorota in Blair's closet in an attempt to find Blair and destroy what she thinks is Blair's "happily ever after". When Chuck and Serena free Dorota, she follows them to the hotel in which Dan and Blair are hiding out and takes a photo while framing Serena for sending the video to Gossip Girl. After taking her camera back from Serena, Georgina is seen putting up a video of Blair and Louis leaving for their honeymoon. Georgina reveals to her Phil, her husband/accomplice, that the real 'Gossip Girl' abandoned her post following Chuck and Blair's accident. Phil appears to love Georgina and knows all about her past and of her agenda against everyone she knows on the Upper East Side and he assists her in times of need despite the fact that she often treats him badly and ignores their baby, Milo, leaving Phil as the parental caregiver at home while she goes out to work her ways.
question: Who is Georgina's baby on Gossip Girl?
short_answers: Milo
wikipage: Georgina Sparks

Long-form answers:
knowledge: content: Georgina Sparks is a fictional character in the Gossip Girl novel series and a recurring character on the television series of the same name, in which she is portrayed by Michelle Trachtenberg. While the novel series portrays her as a harmless, friendly drug-addicted young girl, the television adaption portrays her as a cruel, manipulative young socialite who creates havoc throughout the show.
wikipage: Georgina Sparks
long_answer: Georgina Sparks is a fictional character in the Gossip Girl novel series and a recurring character on the television series of the same name. While the novel series portrays her as a harmless, friendly drug-addicted young girl, the television adaption portrays her as a cruel, manipulative young socialite who creates havoc throughout the show. In the episode Belles de Jour it is revealed Georgina had a son, Milo, born on July 7, 2010, but the father is unknown. In the episode The Undergraduates, Georgina tells Dan about Serge, Milo's "real" father, because he knows that she has been lying.