Let's see: the largest horse in recorded history was a Shire named Mammoth, who was born in 1848. He stood 21.2 hands (86 inches, 218 cm) high, and his peak weight was estimated at 1,524 kilograms (3,360 lb). Celestia's a big girl (for you), so let's say that that's her size. Naim Süleymano, seen by some as history's greatest weightlifter, could lift upwards of 190.0 kilograms, that's 418.9lb. Celestia could be 1/4th of Mammoth's weight and she'd still weight 191 kg more than Naim himself could lift.
You can't lift Princess Celestia.