Britney Spears' Instagram account has once again vanished ... this time on the heels of several posts that have fans concerned -- and her ex-husband Kevin Federline's memoir taking aim at her reputation.

Britney Spears deleted her Instagram account following a flurry of cryptic posts about her health and kids Sean and Jayden, whom she shares with ex Kevin Federline.

Steven McBee Jr. and Allie Eklund publicly confirmed their relationship on Monday, Nov. 3 with a series of photos on Instagram. This comes after fans watched Steven and ex Calah Jackson's tumultuous breakup on season 2 of 'The McBee Dynasty: Real American Cowboys.