Pop superstar Lady GaGa is giving Toni Braxton's singing sister Tamar a big boost as she launches her music career by encouraging her 31 million Twitter.com followers to check out her friend's new single.

Tamar Braxton released her debut song Love & War this week (begs03Dec12) and she already has one big fan on her side.

In a series of Twitter.com posts on Thursday (06Dec12), Gaga writes, "K I Never Promote Artists but if u want your mind blown check @tamarbraxtonher 'Love & War' She's Toni Braxton sister + her voice is Beyond... (sic)

"Buy 'Love And War'... It would mean a lot to me monsters (fans) if u would support her. Its (sic) her turn to shine."

Gaga goes on to reveal that she and the Braxtons have been close for some time, adding: "Myself And @tamarbraxtonher have been the best of friends since her husband Vincent discovered + signed me when I was 20. She Is Incredible".

The Poker Face hitmaker isn't the only celebrity helping Tamar to expand her fanbase - her famous sister Toni and R&B star Ne-Yo have also been tweeting their support for her new song.