Source: Bang Showbiz NewsMadonna has bought her daughter Lourdes an apartment for her 16th birthday after the teenager threatened to move in with her father, personal trainer Carlos Leon.Lourdes Leon celebrated the landmark coming of age birthday on October 14 - while her pop superstar mother was in the middle of her 'MDNA' tour - and Madonna decided the property would be the perfect gift for her daughter to show her how much she trusts her.A source told the Daily Star newspaper: "Lourdes was thrilled. She wants it done up to her taste and then it'll be decided who shares with her and when she moves in."The apartment is located is a few blocks from her family home on the Upper East side of Manhattan and also near the Kabbalah Centre - which Madonna and Lourdes are regular visitors to.The fee the 'Girl Gone Wild' singer paid for the property is undisclosed but it is "in a secure block with a lot of security and access to a swimming pool and gym".The expensive gift comes shortly after it was reported the pair's relationship had become strained in recent months, with Lourdes rebelling against Madonna, 54, and threatening to move in with her father Carlos Leon.Earlier this month, Madonna talked about her relationship with her children - Lourdes, Rocco, 12, her son with ex-husband Guy Ritchie, and adopted kids Mercy James, six, and David Banda, seven - and her passion for her career, and hinted her eldest daughter wouldn't be living at home for much longer.She said: "My children are my first priority and because they are older I can't take them with me on the road everywhere."I really feel I would be an irresponsible parent if I didn't stop my tour and spent time with them. My daughter is going to be leaving home soon."