|Proud father: Rooney revealed the news, with thousands sending their best wishes to the Manchester United striker|
Rooney announced the news on Twitter, telling his legion of over six million followers: 'Our Beautiful Son Klay Anthony Rooney was born at 2.11am, Weighing 7Ib 11.1/2 oz. Both Klay and Coleen are fine..... We're all delighted!!'
Klay means 'he who is immortal' and with Rooney a huge boxing fan, the name could have been inspired by ring great Cassius Clay (now, of course, Muhammad Ali).
|Happy days: After going into labour late on Saturday night, Coleen was delighted to announce the arrival of her second son|
|We are family: Wayne and Coleen Rooney, who already have three-year-old Kai, announced the arrival of their second son Klay in the early hours on Tuesday morning|
'He who is immortal. It is a male name, suitable for baby boys.'
His message, posted at 3.49am, received widespread congratulations from his fans including celebrities Ed Sheeran and Apprentice star Lord Sugar, who were among the first to send their best wishes.
The 27-year-old is expected to have some downtime with his family, including three-year-old son Kai, before linking up with Roy Hodgson's England squad at the weekend ahead of next Wednesday's friendly at Wembley against the Republic of Ireland.
Despite ongoing issues at his club, with his future at Old Trafford seemingly uncertain having asked for a transfer, Rooney is in contention to captain his country.
|National service: Rooney, pictured wearing the new Three Lions strip, will play for England in the upcoming summer friendlies against the Republic of Ireland and Brazil|
The striker is understood to be keen to start afresh under new Manchester United boss David Moyes, his former manager at Everton, and is seeking reassurance about his future.
The pair once fell out over false claims made in the player’s autobiography about Moyes leaking information to the press.
|Over to you David: New United boss Moyes must speak to Rooney about his future after the striker told retiring manager Sir Alex Ferguson that he wanted to leave Old Trafford|
Moyes is expected to meet Rooney, before taking a holiday at the end of this month, as one of the more pressing issues at the start of his Old Trafford reign.