Pop icon Lady Gaga has exercised her social media influence by getting one of her 'best friends' to the No.1 spot on U.S. iTunes after tweeting about her new song.

In a series of posts uploaded to Twitter last night (December 6), the 'Born This Way' icon encouraged her fans to download a track named 'Love and War' by Toni Braxton's sister, Tamar. Gaga wrote:

"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."

"MYSELF AND @tamarbraxtonher have been the best of friends since her husband Vincent discovered + signed me when I was 20. SHE IS INCREDIBLE. Buy "Love And War" http://itunes.com/tamarbraxton  It would mean a lot to me monsters if u would support her. Its her turn to shine. #2 on iTunes!!"

The song is currently still at the top spot and is pushing ahead of Bruno Mars' 'Locked Out Of Heaven' and Taylor Swift's 'I Knew You Were Trouble'.

Listen to Tamar Braxton's 'Love and War' below: