Megan Fox posted a sexy image with her new boyfriend Machine Gun Kelly on Instagram, and hours later her estranged husband Brian Austin Green hilariously responded, Us Weekly reports. Fox's post featured her in a bikini top standing next to the shirtless rapper, with the caption, "Achingly Beautiful Boy … My heart is yours.” Green responded later Wednesday, with pics of his 4 kids, Kassius, 18, whom he shares with ex Vanessa Marcil, and Noah, 7, Bodhi, 6, and Journey, 4, whom he shares with Fox. “Achingly beautiful boys … My heart is yours,” he wrote.