Sequelize.js belongsToMany instance method create not working?

My models:

'use strict';
module.exports = function(sequelize, DataTypes) {
  var Entity;
  return Entity = sequelize.define('Entity', {
    name: {
      type: DataTypes.STRING,
      allowNull: false
    }
  }, {
    classMethods: {
      associate: function(models) {
        return Entity.belongsToMany(models.User);
      }
    }
  });
};

and

'use strict';
module.exports = function(sequelize, DataTypes) {
  var User;
  return User = sequelize.define('User', {
    name: {
      type: DataTypes.STRING,
      allowNull: false
    },
    username: {
      type: DataTypes.STRING,
      allowNull: false,
      unique: true
    },
    email: {
      type: DataTypes.STRING,
      allowNull: false,
      unique: true,
      validate: {
        isEmail: true
      }
    },
    password: {
      type: DataTypes.STRING,
      allowNull: false
    },
    status: {
      type: DataTypes.ENUM('active', 'inactive'),
      defaultValue: 'active'
    }
  }, {
    instanceMethods: {
      display: function() {
        var user;
        user = {
          name: this.name,
          email: this.email,
          username: this.username,
          active: this.active
        };
        return user;
      }
    }
  }, {
    classMethods: {
      associate: function(models) {
        return User.belongsToMany(models.Entity);
      }
    }
  });
};

I want to create a user and then attach one entity to that user, so I am doing:

newUser = {
  name: req.body.name,
  email: req.body.email,
  username: req.body.username,
  password: req.body.password
};

global.db.User.create(newUser).then(function(dbUser) {
  var newEntity;
  newEntity = {
    name: newUser.name + " Default Entity"
  };
  console.log(dbUser);
  return dbUser.createEntity(newEntity);
}).then(function(dbEntity) {
  return console.log(dbEntity);
});

But I get an error: [TypeError: Object [object SequelizeInstance] has no method 'createEntity']

This is using Sequelize v2.0.0-rc8

What am I doing wrong?