Possible Clues:

• We
• We two
• 2011 Lady Gaga hit
• Both of us
• We heard vowel sounds
• 1982 Eddie Rabbitt/Crystal Gale duet
• 1941 Glenn Miller hit that spent five weeks at #1
• Bill Withers "Just the two of us, ___"
• Partners' phrase
• Triple-platinum Lady Gaga hit of 2011